Unable to create the MySQL database for the new portal: creation fails every time

Nakhla Assurances, a regional mutual insurer in Oujda, launches its member portal next week (claims, certificates). The team created a dedicated VPC vpc-nakhla (custom mode, subnet snet-apps 10.10.0.0/20 in europe-west9). Internal security rule: no database with a public IP.

Zakaria, an administrator, has been trying since this morning to create the Cloud SQL MySQL 8.0 instance mysql-portail-prod with private IP only on vpc-nakhla. Every attempt fails. He suspects a permissions problem or an API that is not enabled. The portal's acceptance testing is blocked, and the contractor is billed by the day.

You are on your workstation, with gcloud configured on nakhla-prod-7713 (project number 418273650912), with the Owner role.