Cloud SQL Proxy: "Error during createEphemeral ... Error 403: The client is not authorized to make this...
This is a known IAM propagation quirk, not a proxy bug: re-grant the role to force it to take effect. Remove the Cloud SQL Client role from the failing service account in IAM & Admin > IAM (uncheck it and Save), verify the account disappears from the list, then Add it back with the Cloud SQL Client role and Save. Mult…
Problem outcome: unknown