[google-cloud-sql-discuss] Can't connect to MySQL Cloud Instance from an other App Engine

Hello,

I've 2 projects deployed on GCP (App Engine) :

- Back-office instance

- API Instance with Cloud MySQL Instance

The API can connect to MySQL without problem via the private IP, database name, username and password.

But my other app (Back-office) can't access to the MySQL Instance.

I've follow many example, tutorials...

1/ I've added IAM rights : backoffice have both "Client Cloud SQL" and "Éditeur Cloud SQL"

2/ I've enable all API necessary (Cloud SQL, App engine...) in both projects

3/ I've try flexible and standard environment

4/ I've add a public IP in backoffice and i've add it to MySQL connection 

5/ I used SocketPath for my Apps with Sequelize

6/ I've try both port "3306" and "3307" (why 3307 ? but I've found it in the Google Docs)

So... how can I connect the BackOffice to my Cloud MySQL Instance ?

Thanks for your help !

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