In addition to the specific permissions that are already mentioned, the project also needs the `iam.googleapis.com` API enabled, otherwise authenticating will fail with an error similar to:
```
Error authenticating: Error making API request.
URL: PUT https://localhost:8200/v1/auth/gcp/login
Code: 400. Errors:
* could not find service account key or Google Oauth cert with given 'kid' id
```
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