diff --git a/mssql/features.py b/mssql/features.py
index a60a9283..faaa0bbb 100644
--- a/mssql/features.py
+++ b/mssql/features.py
@@ -6,6 +6,7 @@
 
 
 class DatabaseFeatures(BaseDatabaseFeatures):
+    allows_group_by_select_index = False
     allow_sliced_subqueries_with_in = False
     can_introspect_autofield = True
     can_introspect_json_field = False
@@ -71,4 +72,4 @@ def introspected_field_types(self):
         return {
             **super().introspected_field_types,
             "DurationField": "BigIntegerField",
-        }
\ No newline at end of file
+        }
diff --git a/testapp/settings.py b/testapp/settings.py
index 311e9175..3fb637bb 100644
--- a/testapp/settings.py
+++ b/testapp/settings.py
@@ -99,8 +99,6 @@
 
 TEST_RUNNER = "testapp.runners.ExcludedTestSuiteRunner"
 EXCLUDED_TESTS = [
-    'aggregation.tests.AggregateTestCase.test_expression_on_aggregation',
-    'aggregation_regress.tests.AggregationTests.test_annotated_conditional_aggregate',
     'aggregation_regress.tests.AggregationTests.test_annotation_with_value',
     'aggregation.tests.AggregateTestCase.test_distinct_on_aggregate',
     'annotations.tests.NonAggregateAnnotationTestCase.test_annotate_exists',
@@ -173,9 +171,7 @@
     'expressions.tests.FTimeDeltaTests.test_time_subquery_subtraction',
     'migrations.test_operations.OperationTests.test_alter_field_reloads_state_on_fk_with_to_field_target_type_change',
     'schema.tests.SchemaTests.test_alter_smallint_pk_to_smallautofield_pk',
-    
     'annotations.tests.NonAggregateAnnotationTestCase.test_combined_expression_annotation_with_aggregation',
-    'db_functions.comparison.test_cast.CastTests.test_cast_to_integer',
     'db_functions.datetime.test_extract_trunc.DateFunctionTests.test_extract_func',
     'db_functions.datetime.test_extract_trunc.DateFunctionTests.test_extract_iso_weekday_func',
     'db_functions.datetime.test_extract_trunc.DateFunctionWithTimeZoneTests.test_extract_func',