diff --git a/lib/pages/spaces_management/assign_tag/bloc/assign_tag_bloc.dart b/lib/pages/spaces_management/assign_tag/bloc/assign_tag_bloc.dart
index 3de906d3..a06e6977 100644
--- a/lib/pages/spaces_management/assign_tag/bloc/assign_tag_bloc.dart
+++ b/lib/pages/spaces_management/assign_tag/bloc/assign_tag_bloc.dart
@@ -4,7 +4,9 @@ import 'package:syncrow_web/pages/spaces_management/assign_tag/bloc/assign_tag_e
 import 'package:syncrow_web/pages/spaces_management/assign_tag/bloc/assign_tag_state.dart';
 
 class AssignTagBloc extends Bloc<AssignTagEvent, AssignTagState> {
-  AssignTagBloc() : super(AssignTagInitial()) {
+  final List<String> allTags;
+
+  AssignTagBloc(this.allTags) : super(AssignTagInitial()) {
     on<InitializeTags>((event, emit) {
       final initialTags = event.initialTags ?? [];
 
@@ -16,25 +18,25 @@ class AssignTagBloc extends Bloc<AssignTagEvent, AssignTagState> {
         }
       }
 
-      final allTags = <Tag>[];
+      final tags = <Tag>[];
 
       for (var selectedProduct in event.addedProducts) {
         final existingCount = existingTagCounts[selectedProduct.productId] ?? 0;
 
         if (selectedProduct.count == 0 ||
             selectedProduct.count <= existingCount) {
-          allTags.addAll(initialTags
+          tags.addAll(initialTags
               .where((tag) => tag.product?.uuid == selectedProduct.productId));
           continue;
         }
 
         final missingCount = selectedProduct.count - existingCount;
 
-        allTags.addAll(initialTags
+        tags.addAll(initialTags
             .where((tag) => tag.product?.uuid == selectedProduct.productId));
 
         if (missingCount > 0) {
-          allTags.addAll(List.generate(
+          tags.addAll(List.generate(
             missingCount,
             (index) => Tag(
               tag: '',
@@ -45,10 +47,14 @@ class AssignTagBloc extends Bloc<AssignTagEvent, AssignTagState> {
         }
       }
 
+      final updatedTags = _calculateAvailableTags(allTags, tags);
+
       emit(AssignTagLoaded(
-          tags: allTags,
-          isSaveEnabled: _validateTags(allTags),
-          errorMessage: ''));
+        tags: tags,
+        updatedTags: updatedTags, 
+        isSaveEnabled: _validateTags(tags),
+        errorMessage: '',
+      ));
     });
 
     on<UpdateTagEvent>((event, emit) {
@@ -56,10 +62,13 @@ class AssignTagBloc extends Bloc<AssignTagEvent, AssignTagState> {
 
       if (currentState is AssignTagLoaded && currentState.tags.isNotEmpty) {
         final tags = List<Tag>.from(currentState.tags);
-        tags[event.index].tag = event.tag;
+        tags[event.index] = tags[event.index].copyWith(tag: event.tag);
+
+        final updatedTags = _calculateAvailableTags(allTags, tags);
 
         emit(AssignTagLoaded(
           tags: tags,
+          updatedTags: updatedTags,
           isSaveEnabled: _validateTags(tags),
           errorMessage: _getValidationError(tags),
         ));
@@ -72,12 +81,15 @@ class AssignTagBloc extends Bloc<AssignTagEvent, AssignTagState> {
       if (currentState is AssignTagLoaded && currentState.tags.isNotEmpty) {
         final tags = List<Tag>.from(currentState.tags);
 
-        // Use copyWith for immutability
+        // Update the location
         tags[event.index] =
             tags[event.index].copyWith(location: event.location);
 
+        final updatedTags = _calculateAvailableTags(allTags, tags);
+
         emit(AssignTagLoaded(
           tags: tags,
+          updatedTags: updatedTags,
           isSaveEnabled: _validateTags(tags),
           errorMessage: _getValidationError(tags),
         ));
@@ -92,6 +104,7 @@ class AssignTagBloc extends Bloc<AssignTagEvent, AssignTagState> {
 
         emit(AssignTagLoaded(
           tags: tags,
+          updatedTags: _calculateAvailableTags(allTags, tags),
           isSaveEnabled: _validateTags(tags),
           errorMessage: _getValidationError(tags),
         ));
@@ -102,38 +115,37 @@ class AssignTagBloc extends Bloc<AssignTagEvent, AssignTagState> {
       final currentState = state;
 
       if (currentState is AssignTagLoaded && currentState.tags.isNotEmpty) {
-        final updatedTags = List<Tag>.from(currentState.tags)
+        final tags = List<Tag>.from(currentState.tags)
           ..remove(event.tagToDelete);
 
+        // Recalculate available tags
+        final updatedTags = _calculateAvailableTags(allTags, tags);
+
         emit(AssignTagLoaded(
-          tags: updatedTags,
-          isSaveEnabled: _validateTags(updatedTags),
-          errorMessage: _getValidationError(updatedTags),
+          tags: tags,
+          updatedTags: updatedTags,
+          isSaveEnabled: _validateTags(tags),
+          errorMessage: _getValidationError(tags),
         ));
-      } else {
-        emit(const AssignTagLoaded(
-            tags: [],
-            isSaveEnabled: false,
-            errorMessage: 'Failed to delete tag'));
       }
     });
   }
 
+  // Validate the tags for duplicates or empty values
   bool _validateTags(List<Tag> tags) {
     final uniqueTags = tags.map((tag) => tag.tag?.trim() ?? '').toSet();
     final hasEmptyTag = tags.any((tag) => (tag.tag?.trim() ?? '').isEmpty);
-    final isValid = uniqueTags.length == tags.length && !hasEmptyTag;
-    return isValid;
+    return uniqueTags.length == tags.length && !hasEmptyTag;
   }
 
+  // Get validation error for duplicate tags
   String? _getValidationError(List<Tag> tags) {
-    final hasEmptyTag = tags.any((tag) => (tag.tag?.trim() ?? '').isEmpty);
-    if (hasEmptyTag) {
-      return 'Tags cannot be empty.';
-    }
-
-    final duplicateTags = tags
+    final nonEmptyTags = tags
         .map((tag) => tag.tag?.trim() ?? '')
+        .where((tag) => tag.isNotEmpty)
+        .toList();
+
+    final duplicateTags = nonEmptyTags
         .fold<Map<String, int>>({}, (map, tag) {
           map[tag] = (map[tag] ?? 0) + 1;
           return map;
@@ -149,4 +161,15 @@ class AssignTagBloc extends Bloc<AssignTagEvent, AssignTagState> {
 
     return null;
   }
+
+  List<String> _calculateAvailableTags(List<String> allTags, List<Tag> tags) {
+    final selectedTags = tags
+        .where((tag) => (tag.tag?.trim().isNotEmpty ?? false))
+        .map((tag) => tag.tag!.trim())
+        .toSet();
+
+    final availableTags =
+        allTags.where((tag) => !selectedTags.contains(tag.trim())).toList();
+    return availableTags;
+  }
 }
diff --git a/lib/pages/spaces_management/assign_tag/bloc/assign_tag_state.dart b/lib/pages/spaces_management/assign_tag/bloc/assign_tag_state.dart
index 1ae0ea90..6a2dae4b 100644
--- a/lib/pages/spaces_management/assign_tag/bloc/assign_tag_state.dart
+++ b/lib/pages/spaces_management/assign_tag/bloc/assign_tag_state.dart
@@ -1,6 +1,5 @@
 import 'package:equatable/equatable.dart';
 import 'package:syncrow_web/pages/spaces_management/all_spaces/model/tag.dart';
-import 'package:syncrow_web/pages/spaces_management/space_model/models/tag_model.dart';
 
 abstract class AssignTagState extends Equatable {
   const AssignTagState();
@@ -15,17 +14,21 @@ class AssignTagLoading extends AssignTagState {}
 
 class AssignTagLoaded extends AssignTagState {
   final List<Tag> tags;
+  final List<String> updatedTags; 
+
   final bool isSaveEnabled;
-  final String?  errorMessage;
+  final String? errorMessage;
 
   const AssignTagLoaded({
     required this.tags,
     required this.isSaveEnabled,
+    required this.updatedTags,
     required this.errorMessage,
   });
 
   @override
-  List<Object> get props => [tags, isSaveEnabled, errorMessage ?? ''];
+  List<Object> get props =>
+      [tags, updatedTags, isSaveEnabled, errorMessage ?? ''];
 }
 
 class AssignTagError extends AssignTagState {
diff --git a/lib/pages/spaces_management/assign_tag/views/assign_tag_dialog.dart b/lib/pages/spaces_management/assign_tag/views/assign_tag_dialog.dart
index 9e2fee32..3b794b61 100644
--- a/lib/pages/spaces_management/assign_tag/views/assign_tag_dialog.dart
+++ b/lib/pages/spaces_management/assign_tag/views/assign_tag_dialog.dart
@@ -14,6 +14,7 @@ import 'package:syncrow_web/pages/spaces_management/assign_tag/bloc/assign_tag_e
 import 'package:syncrow_web/pages/spaces_management/assign_tag/bloc/assign_tag_state.dart';
 import 'package:syncrow_web/pages/spaces_management/helper/tag_helper.dart';
 import 'package:syncrow_web/utils/color_manager.dart';
+import 'package:uuid/uuid.dart';
 
 class AssignTagDialog extends StatelessWidget {
   final List<ProductModel>? products;
@@ -47,7 +48,7 @@ class AssignTagDialog extends StatelessWidget {
       ..add('Main Space');
 
     return BlocProvider(
-      create: (_) => AssignTagBloc()
+      create: (_) => AssignTagBloc(allTags ?? [])
         ..add(InitializeTags(
           initialTags: initialTags,
           addedProducts: addedProducts,
@@ -119,8 +120,6 @@ class AssignTagDialog extends StatelessWidget {
                             : List.generate(state.tags.length, (index) {
                                 final tag = state.tags[index];
                                 final controller = controllers[index];
-                                final availableTags = getAvailableTags(
-                                    allTags ?? [], state.tags, tag);
 
                                 return DataRow(
                                   cells: [
@@ -180,7 +179,9 @@ class AssignTagDialog extends StatelessWidget {
                                           width: double
                                               .infinity, // Ensure full width for dropdown
                                           child: DialogTextfieldDropdown(
-                                            items: availableTags,
+                                            key: ValueKey(
+                                                'dropdown_${Uuid().v4()}_${index}'),
+                                            items: state.updatedTags,
                                             initialValue: tag.tag,
                                             onSelected: (value) {
                                               controller.text = value;
@@ -306,15 +307,4 @@ class AssignTagDialog extends StatelessWidget {
       ),
     );
   }
-
-  List<String> getAvailableTags(
-      List<String> allTags, List<Tag> currentTags, Tag currentTag) {
-    List<String> availableTagsForTagModel = TagHelper.getAvailableTags<Tag>(
-      allTags: allTags,
-      currentTags: currentTags,
-      currentTag: currentTag,
-      getTag: (tag) => tag.tag ?? '',
-    );
-    return availableTagsForTagModel;
-  }
 }
diff --git a/lib/pages/spaces_management/assign_tag_models/bloc/assign_tag_model_bloc.dart b/lib/pages/spaces_management/assign_tag_models/bloc/assign_tag_model_bloc.dart
index 92d7c0e1..d0e37f6a 100644
--- a/lib/pages/spaces_management/assign_tag_models/bloc/assign_tag_model_bloc.dart
+++ b/lib/pages/spaces_management/assign_tag_models/bloc/assign_tag_model_bloc.dart
@@ -5,7 +5,9 @@ import 'package:syncrow_web/pages/spaces_management/space_model/models/tag_model
 
 class AssignTagModelBloc
     extends Bloc<AssignTagModelEvent, AssignTagModelState> {
-  AssignTagModelBloc() : super(AssignTagModelInitial()) {
+  final List<String> allTags;
+
+  AssignTagModelBloc(this.allTags) : super(AssignTagModelInitial()) {
     on<InitializeTagModels>((event, emit) {
       final initialTags = event.initialTags ?? [];
 
@@ -17,25 +19,25 @@ class AssignTagModelBloc
         }
       }
 
-      final allTags = <TagModel>[];
+      final tags = <TagModel>[];
 
       for (var selectedProduct in event.addedProducts) {
         final existingCount = existingTagCounts[selectedProduct.productId] ?? 0;
 
         if (selectedProduct.count == 0 ||
             selectedProduct.count <= existingCount) {
-          allTags.addAll(initialTags
+          tags.addAll(initialTags
               .where((tag) => tag.product?.uuid == selectedProduct.productId));
           continue;
         }
 
         final missingCount = selectedProduct.count - existingCount;
 
-        allTags.addAll(initialTags
+        tags.addAll(initialTags
             .where((tag) => tag.product?.uuid == selectedProduct.productId));
 
         if (missingCount > 0) {
-          allTags.addAll(List.generate(
+          tags.addAll(List.generate(
             missingCount,
             (index) => TagModel(
               tag: '',
@@ -46,9 +48,12 @@ class AssignTagModelBloc
         }
       }
 
+      final updatedTags = _calculateAvailableTags(allTags, tags);
+
       emit(AssignTagModelLoaded(
-          tags: allTags,
-          isSaveEnabled: _validateTags(allTags),
+          tags: tags,
+          updatedTags: updatedTags,
+          isSaveEnabled: _validateTags(tags),
           errorMessage: ''));
     });
 
@@ -57,9 +62,12 @@ class AssignTagModelBloc
       if (currentState is AssignTagModelLoaded &&
           currentState.tags.isNotEmpty) {
         final tags = List<TagModel>.from(currentState.tags);
-        tags[event.index].tag = event.tag;
+        tags[event.index] = tags[event.index].copyWith(tag: event.tag);
+        final updatedTags = _calculateAvailableTags(allTags, tags);
+
         emit(AssignTagModelLoaded(
           tags: tags,
+          updatedTags: updatedTags,
           isSaveEnabled: _validateTags(tags),
           errorMessage: _getValidationError(tags),
         ));
@@ -77,9 +85,13 @@ class AssignTagModelBloc
         tags[event.index] =
             tags[event.index].copyWith(location: event.location);
 
+        final updatedTags = _calculateAvailableTags(allTags, tags);
+
         emit(AssignTagModelLoaded(
           tags: tags,
+          updatedTags: updatedTags,
           isSaveEnabled: _validateTags(tags),
+          errorMessage: _getValidationError(tags),
         ));
       }
     });
@@ -93,6 +105,7 @@ class AssignTagModelBloc
 
         emit(AssignTagModelLoaded(
           tags: tags,
+          updatedTags: _calculateAvailableTags(allTags, tags),
           isSaveEnabled: _validateTags(tags),
           errorMessage: _getValidationError(tags),
         ));
@@ -104,24 +117,22 @@ class AssignTagModelBloc
 
       if (currentState is AssignTagModelLoaded &&
           currentState.tags.isNotEmpty) {
-        final updatedTags = List<TagModel>.from(currentState.tags)
+        final tags = List<TagModel>.from(currentState.tags)
           ..remove(event.tagToDelete);
 
+        final updatedTags = _calculateAvailableTags(allTags, tags);
+
         emit(AssignTagModelLoaded(
-          tags: updatedTags,
-          isSaveEnabled: _validateTags(updatedTags),
+          tags: tags,
+          updatedTags: updatedTags,
+          isSaveEnabled: _validateTags(tags),
+          errorMessage: _getValidationError(tags),
         ));
-      } else {
-        emit(const AssignTagModelLoaded(
-          tags: [],
-          isSaveEnabled: false,
-        ));
-      }
+      } 
     });
   }
 
   bool _validateTags(List<TagModel> tags) {
-    
     final uniqueTags = tags.map((tag) => tag.tag?.trim() ?? '').toSet();
     final hasEmptyTag = tags.any((tag) => (tag.tag?.trim() ?? '').isEmpty);
     final isValid = uniqueTags.length == tags.length && !hasEmptyTag;
@@ -129,14 +140,14 @@ class AssignTagModelBloc
   }
 
   String? _getValidationError(List<TagModel> tags) {
-    final hasEmptyTag = tags.any((tag) => (tag.tag?.trim() ?? '').isEmpty);
-    if (hasEmptyTag) {
-      return 'Tags cannot be empty.';
-    }
-
     // Check for duplicate tags
-    final duplicateTags = tags
+
+    final nonEmptyTags = tags
         .map((tag) => tag.tag?.trim() ?? '')
+        .where((tag) => tag.isNotEmpty)
+        .toList();
+
+    final duplicateTags = nonEmptyTags
         .fold<Map<String, int>>({}, (map, tag) {
           map[tag] = (map[tag] ?? 0) + 1;
           return map;
@@ -152,4 +163,16 @@ class AssignTagModelBloc
 
     return null;
   }
+
+  List<String> _calculateAvailableTags(
+      List<String> allTags, List<TagModel> tags) {
+    final selectedTags = tags
+        .where((tag) => (tag.tag?.trim().isNotEmpty ?? false))
+        .map((tag) => tag.tag!.trim())
+        .toSet();
+
+    final availableTags =
+        allTags.where((tag) => !selectedTags.contains(tag.trim())).toList();
+    return availableTags;
+  }
 }
diff --git a/lib/pages/spaces_management/assign_tag_models/bloc/assign_tag_model_state.dart b/lib/pages/spaces_management/assign_tag_models/bloc/assign_tag_model_state.dart
index a51a9e8f..167a6ac2 100644
--- a/lib/pages/spaces_management/assign_tag_models/bloc/assign_tag_model_state.dart
+++ b/lib/pages/spaces_management/assign_tag_models/bloc/assign_tag_model_state.dart
@@ -17,14 +17,17 @@ class AssignTagModelLoaded extends AssignTagModelState {
   final bool isSaveEnabled;
   final String? errorMessage;
 
+  final List<String> updatedTags;
+
   const AssignTagModelLoaded({
     required this.tags,
     required this.isSaveEnabled,
+    required this.updatedTags,
     this.errorMessage,
   });
 
   @override
-  List<Object?> get props => [tags, isSaveEnabled, errorMessage];
+  List<Object?> get props => [tags, updatedTags, isSaveEnabled, errorMessage];
 }
 
 class AssignTagModelError extends AssignTagModelState {
diff --git a/lib/pages/spaces_management/assign_tag_models/views/assign_tag_models_dialog.dart b/lib/pages/spaces_management/assign_tag_models/views/assign_tag_models_dialog.dart
index 3e302d2d..d13766d4 100644
--- a/lib/pages/spaces_management/assign_tag_models/views/assign_tag_models_dialog.dart
+++ b/lib/pages/spaces_management/assign_tag_models/views/assign_tag_models_dialog.dart
@@ -16,6 +16,7 @@ import 'package:syncrow_web/pages/spaces_management/space_model/widgets/dialog/c
 import 'package:syncrow_web/pages/spaces_management/tag_model/views/add_device_type_model_widget.dart';
 import 'package:syncrow_web/utils/color_manager.dart';
 import 'package:syncrow_web/pages/spaces_management/helper/tag_helper.dart';
+import 'package:uuid/uuid.dart';
 
 class AssignTagModelsDialog extends StatelessWidget {
   final List<ProductModel>? products;
@@ -56,7 +57,7 @@ class AssignTagModelsDialog extends StatelessWidget {
       ..add('Main Space');
 
     return BlocProvider(
-        create: (_) => AssignTagModelBloc()
+        create: (_) => AssignTagModelBloc(allTags ?? [])
           ..add(InitializeTagModels(
             initialTags: initialTags,
             addedProducts: addedProducts,
@@ -134,9 +135,6 @@ class AssignTagModelsDialog extends StatelessWidget {
                                 : List.generate(state.tags.length, (index) {
                                     final tag = state.tags[index];
                                     final controller = controllers[index];
-                                    final availableTags =
-                                        TagHelper.getAvailableTagModels(
-                                            allTags ?? [], state.tags, tag);
 
                                     return DataRow(
                                       cells: [
@@ -196,7 +194,9 @@ class AssignTagModelsDialog extends StatelessWidget {
                                               width: double
                                                   .infinity, // Ensure full width for dropdown
                                               child: DialogTextfieldDropdown(
-                                                items: availableTags,
+                                                 key: ValueKey(
+                                                'dropdown_${Uuid().v4()}_${index}'),
+                                                items: state.updatedTags,
                                                 initialValue: tag.tag,
                                                 onSelected: (value) {
                                                   controller.text = value;