An Azure managed MySQL database service for app development and deployment.
Hi, because even a password-only update is returning ProvisionNotSupportedForRegion, this is unlikely to be your password or ARM syntax. It normally points to the server's current SKU/availability-zone combination or a regional subscription entitlement/capacity restriction. Please export the server properties and activity-log failure, then try a harmless update through CLI only once to capture the correlation ID. Do not delete the server as a workaround. Open a MySQL Flexible Server support case with the server resource ID, region, SKU, zone, API version, operation name, correlation ID, and UTC time, and ask the service team to check the regional provisioning stamp/entitlement for that existing server.