When running: gcloud sql instances create example --tier=db-n1-standard-1 --region=europe-west1
I get the error in the title, though I'm not too sure why as I do have the 'Google Cloud SQL API' enabled.
What is the cause of this error?
It seems it takes a while (a few minutes) a for the change to propagate.
For posterity, it is also possible that the API has not been enabled, which in that case you'd want to enable it here: https://cloud.google.com/sql/docs/mysql/admin-api/#console.