Hi Fikri, Thanks for posting here in Microsoft community, here’s what you can try.
To fix the country code does not match error, first, double-check country code, ensure you're selecting +62 (Indonesia) from the dropdown, not typing it manually.
Then remove formatting: Enter your number without spaces, dashes, or leading zero. Example: 81234567890 not 0812... or +62812...
Also, Clear cache or use incognito mode: Sometimes browser cache causes issues.
And try a different browser/device, you’ve done this good step.
Wait 24 hours, If the number was recently removed, it might still be in a cooldown period.
Also, you can Contact Microsoft Support, if it still fails, they may need to manually release the number. https://support.microsoft.com/en-us/contactus
I hope this helps you out. Let me know
Chard.