PostgreSQL version 17 has been available on Azure since July, but the Flexible Server API spec does not currently support it (only versions up to 16 are listed in the enum).

Between creating the MySQL flexible server and the Private Endpoint, apply this YAML and wait for each instance to go into a ready state. It will take a few minutes ...

Azure now offers paid Extended Support for MySQL 5.7 and 8.0, providing security updates and SLA coverage beyond community EOL.