[google-cloud-sql-discuss] How to give one GCP project access to another GCP project's SQL database?

I am getting this error. 

CloudSQL warning: your action is needed to update your function and avoid potential disruptions. Please see https://cloud.google.com/functions/docs/sql#troubleshooting for additional details: ensure that the account has access to "xyzapp:us-central1:db-11-dev" (and make sure there's no typo in that name). Error during createEphemeral for xyzapp:us-central1:db-11-dev: googleapi: Error 403: The client is not authorized to make this request., notAuthorized

ProjectA: We run the App on this

Project B: All the database instances and databases are setup here

Project A needs to have access to Project B's databases.

I have enabled Cloud SQL Admin API for project A. But I don't know how to grant access to CLOUD SQL Admin API from project B Database.

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