Hi
LonLee •,
Welcome to Microsoft Q&A forum.
As I understand, you could not create Azure Database for MySQL Flexible Server in Southeast Region.
Yes you are right, currently we could not provision Azure Database for MySQL Flexible Server in Southeast Asia region for few subscriptions.
We request you try for some other region.
If you want in Southeast Asia region only, then I would recommend you to raise support case.
Let us know if you face any issue in doing the same.
Thanks