Resolving the "Service account is not available" error
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Updated at November 27, 2023
Issue description
When making a request via REST API, you see this error: Service account is not available.
Solution
Add the iam.serviceAccounts.user role for the service account or user making the request.
Note
If you make a request on behalf of a service account, it must have rights to use itself as a subject.
For example, the Serverless Containers service checks the rights to use the assigned service account when creating a new container revision.