Google Cloud connection issues


hope all of you are doing well.
I’m a newbie on astronomer/airflow world and I’m trying to configure my 1st GCP connection using the following as reference document Managing Airflow connections  |  Cloud Composer  |  Google Cloud

By performing the following configuration on the airflow UI


where key file JSON property is the JSON obtained from the service account created for the purpose.


after running the test DAG I have the following error

  File "/usr/local/lib/python3.9/site-packages/google/api_core/", line 69, in error_remapped_callable
    six.raise_from(exceptions.from_grpc_error(exc), exc)
  File "<string>", line 3, in raise_from
google.api_core.exceptions.Unauthenticated: 401 Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See
[2021-11-11, 16:09:44 UTC] {} INFO - Task exited with return code 1
[2021-11-11, 16:09:44 UTC] {} INFO - 0 downstream tasks scheduled from follow-on schedule check

can you help me to solve the issue with the connection config please?

thank you.