Backups failing on Azure server - Connections using insecure transport are prohibited

[W3ap0n-X]

A user with a WordPress site on an Azure server is getting the below error when attempting a backup:

Connection to mysql failed with message: SQLSTATE[HY000] [3159] Connections using insecure transport are prohibited while --require_secure_transport=ON.

Did some research and recommended adding the following to wp-config.php:
define('DB_SSL', true);

Error still persists when attempting a backup.