You are able to enable the flag on your instance, however, there are some restrictions or
unsupported feature on some activity that only Super Users (backend) have access to and therefore you might get the same error you are encountering now.
In addition, what might have happened here, is that the privileges of root was revoked and to grant root privileges, could you try to run the command below in your Cloud SQL instance and try again:
- GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;
Please note that Google Groups is reserved for general product discussions and is not for technical support. If the issue persists, I would suggest to post a detailed description of the issue and post it on
Stackoverflow, as experienced programmers are within reach and ready to help.