diff --git a/google/cloud/channel_v1/services/cloud_channel_service/client.py b/google/cloud/channel_v1/services/cloud_channel_service/client.py
index 7d8d819..cafe721 100644
--- a/google/cloud/channel_v1/services/cloud_channel_service/client.py
+++ b/google/cloud/channel_v1/services/cloud_channel_service/client.py
@@ -427,7 +427,8 @@ 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=(
+                always_use_jwt_access=not credentials
+                and (
                     Transport == type(self).get_transport_class("grpc")
                     or Transport == type(self).get_transport_class("grpc_asyncio")
                 ),