Hi,

I'm working on a tool which has localdev, dev, staging and prod 
environments. We use the same credentials (client ID, client secret, 
refresh token and developer token) across localdev, dev and staging.

Recently we've begun seeing an auth error on staging, when sending to 
either of our two test accounts, which share the same master account. We do 
not see this error on localdev or dev. The prod site hasn't been in use 
since we saw this issue so we don't know whether prod is also affected.

We are running the same build on both dev and staging sites. We also 
recently upgraded to Ads API v9 from v7, but we were seeing this error on 
staging both before and after we released the update to staging. We've also 
checked the auth values on staging are being passed through to the service 
correctly and they are exactly the same as on the dev service.

Do you have any idea what might be causing this, please?

See logs below:
2021-11-26 10:21:33,185 WARN  c.g.a.googleads.lib.request.summary 
[grpc-default-executor-0] - FAILURE REQUEST SUMMARY. Method: 
google.ads.googleads.v9.services.AdGroupAdService/MutateAdGroupAds, 
Endpoint: googleads.googleapis.com:443, CustomerID: xxxxxxxx, RequestID: 
null, ResponseCode: UNAVAILABLE, Fault: Credentials failed to obtain 
metadata.
2021-11-26 10:21:33,185 INFO  c.g.ads.googleads.lib.request.detail 
[grpc-default-executor-0] - FAILURE REQUEST DETAIL.
2021-11-26T10:21:33.186+00:00 Request
2021-11-26T10:21:33.186+00:00-------
2021-11-26T10:21:33.186+00:00 MethodName: 
google.ads.googleads.v9.services.AdGroupAdService/MutateAdGroupAds
2021-11-26T10:21:33.186+00:00 Endpoint: googleads.googleapis.com:443
Headers: {developer-token=REDACTED, login-customer-id=xxxxxxxxx, 
x-goog-api-client=gl-java/11.0.13 gccl/task ':google-ads:jar' property 
'archiveVersion' gapic/task ':google-ads:jar' property 'archiveVersion' 
gax/2.6.1 grpc/task ':google-ads:jar' property 'archiveVersion'}
......
Response
--------
Headers: null
Body: null
Failure message: null
Status: Status{code=UNAVAILABLE, description=Credentials failed to obtain 
metadata, cause=com.google.api.client.http.HttpResponseException: 401 
Unauthorized
POST https://oauth2.googleapis.com/token
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1116)
at 
com.google.auth.oauth2.UserCredentials.doRefreshAccessToken(UserCredentials.java:273)
at 
com.google.auth.oauth2.UserCredentials.refreshAccessToken(UserCredentials.java:190)
at 
com.google.auth.oauth2.OAuth2Credentials$1.call(OAuth2Credentials.java:257)
at 
com.google.auth.oauth2.OAuth2Credentials$1.call(OAuth2Credentials.java:254)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown 
Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown 
Source)
at java.base/java.lang.Thread.run(Unknown Source)
}.

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