diff --git a/google/cloud/data_fusion_v1/services/data_fusion/client.py b/google/cloud/data_fusion_v1/services/data_fusion/client.py
index 14ea870..27224a8 100644
--- a/google/cloud/data_fusion_v1/services/data_fusion/client.py
+++ b/google/cloud/data_fusion_v1/services/data_fusion/client.py
@@ -350,6 +350,10 @@ def __init__(
                 client_cert_source_for_mtls=client_cert_source_func,
                 quota_project_id=client_options.quota_project_id,
                 client_info=client_info,
+                always_use_jwt_access=(
+                    Transport == type(self).get_transport_class("grpc")
+                    or Transport == type(self).get_transport_class("grpc_asyncio")
+                ),
             )
 
     def list_available_versions(
diff --git a/tests/unit/gapic/data_fusion_v1/test_data_fusion.py b/tests/unit/gapic/data_fusion_v1/test_data_fusion.py
index 12fbbd0..5c40998 100644
--- a/tests/unit/gapic/data_fusion_v1/test_data_fusion.py
+++ b/tests/unit/gapic/data_fusion_v1/test_data_fusion.py
@@ -119,16 +119,6 @@ def test_data_fusion_client_from_service_account_info(client_class):
         assert client.transport._host == "datafusion.googleapis.com:443"
 
 
-@pytest.mark.parametrize("client_class", [DataFusionClient, DataFusionAsyncClient,])
-def test_data_fusion_client_service_account_always_use_jwt(client_class):
-    with mock.patch.object(
-        service_account.Credentials, "with_always_use_jwt_access", create=True
-    ) as use_jwt:
-        creds = service_account.Credentials(None, None, None)
-        client = client_class(credentials=creds)
-        use_jwt.assert_not_called()
-
-
 @pytest.mark.parametrize(
     "transport_class,transport_name",
     [
@@ -136,7 +126,7 @@ def test_data_fusion_client_service_account_always_use_jwt(client_class):
         (transports.DataFusionGrpcAsyncIOTransport, "grpc_asyncio"),
     ],
 )
-def test_data_fusion_client_service_account_always_use_jwt_true(
+def test_data_fusion_client_service_account_always_use_jwt(
     transport_class, transport_name
 ):
     with mock.patch.object(
@@ -146,6 +136,13 @@ def test_data_fusion_client_service_account_always_use_jwt_true(
         transport = transport_class(credentials=creds, always_use_jwt_access=True)
         use_jwt.assert_called_once_with(True)
 
+    with mock.patch.object(
+        service_account.Credentials, "with_always_use_jwt_access", create=True
+    ) as use_jwt:
+        creds = service_account.Credentials(None, None, None)
+        transport = transport_class(credentials=creds, always_use_jwt_access=False)
+        use_jwt.assert_not_called()
+
 
 @pytest.mark.parametrize("client_class", [DataFusionClient, DataFusionAsyncClient,])
 def test_data_fusion_client_from_service_account_file(client_class):
@@ -222,6 +219,7 @@ def test_data_fusion_client_client_options(
             client_cert_source_for_mtls=None,
             quota_project_id=None,
             client_info=transports.base.DEFAULT_CLIENT_INFO,
+            always_use_jwt_access=True,
         )
 
     # Check the case api_endpoint is not provided and GOOGLE_API_USE_MTLS_ENDPOINT is
@@ -238,6 +236,7 @@ def test_data_fusion_client_client_options(
                 client_cert_source_for_mtls=None,
                 quota_project_id=None,
                 client_info=transports.base.DEFAULT_CLIENT_INFO,
+                always_use_jwt_access=True,
             )
 
     # Check the case api_endpoint is not provided and GOOGLE_API_USE_MTLS_ENDPOINT is
@@ -254,6 +253,7 @@ def test_data_fusion_client_client_options(
                 client_cert_source_for_mtls=None,
                 quota_project_id=None,
                 client_info=transports.base.DEFAULT_CLIENT_INFO,
+                always_use_jwt_access=True,
             )
 
     # Check the case api_endpoint is not provided and GOOGLE_API_USE_MTLS_ENDPOINT has
@@ -282,6 +282,7 @@ def test_data_fusion_client_client_options(
             client_cert_source_for_mtls=None,
             quota_project_id="octopus",
             client_info=transports.base.DEFAULT_CLIENT_INFO,
+            always_use_jwt_access=True,
         )
 
 
@@ -346,6 +347,7 @@ def test_data_fusion_client_mtls_env_auto(
                 client_cert_source_for_mtls=expected_client_cert_source,
                 quota_project_id=None,
                 client_info=transports.base.DEFAULT_CLIENT_INFO,
+                always_use_jwt_access=True,
             )
 
     # Check the case ADC client cert is provided. Whether client cert is used depends on
@@ -379,6 +381,7 @@ def test_data_fusion_client_mtls_env_auto(
                         client_cert_source_for_mtls=expected_client_cert_source,
                         quota_project_id=None,
                         client_info=transports.base.DEFAULT_CLIENT_INFO,
+                        always_use_jwt_access=True,
                     )
 
     # Check the case client_cert_source and ADC client cert are not provided.
@@ -400,6 +403,7 @@ def test_data_fusion_client_mtls_env_auto(
                     client_cert_source_for_mtls=None,
                     quota_project_id=None,
                     client_info=transports.base.DEFAULT_CLIENT_INFO,
+                    always_use_jwt_access=True,
                 )
 
 
@@ -430,6 +434,7 @@ def test_data_fusion_client_client_options_scopes(
             client_cert_source_for_mtls=None,
             quota_project_id=None,
             client_info=transports.base.DEFAULT_CLIENT_INFO,
+            always_use_jwt_access=True,
         )
 
 
@@ -460,6 +465,7 @@ def test_data_fusion_client_client_options_credentials_file(
             client_cert_source_for_mtls=None,
             quota_project_id=None,
             client_info=transports.base.DEFAULT_CLIENT_INFO,
+            always_use_jwt_access=True,
         )
 
 
@@ -477,6 +483,7 @@ def test_data_fusion_client_client_options_from_dict():
             client_cert_source_for_mtls=None,
             quota_project_id=None,
             client_info=transports.base.DEFAULT_CLIENT_INFO,
+            always_use_jwt_access=True,
         )