How to fix "We don't support that country code. Use an email instead."

I know, there are tons of forums just to solve this problems, but none of them worked, because it was made probably 2 - 5 years ago.
I'm from Malaysia, and everytime I try to put my phone number it happens

It happens to lots of people tbh and idk wtf is going on Microsoft. But please guide me to fix this issue, and no Microsoft, its not "It is what it is", its NOT.

Answer my question politely, like daem, I've seen some of other Microsoft replies.

It kinda suck tbh