gRPC
16 UNAUTHENTICATED
The request does not have valid authentication credentials for the operation.
When You See This Code
No credentials were provided, or the provided token/certificate is expired or invalid. Different from PERMISSION_DENIED (code 7), which means authenticated but not authorized.
How to Fix
Provide valid authentication credentials (e.g., refresh the OAuth token, regenerate the API key, or renew the client certificate).