I’m on an unsupported region as well, but I managed to claim in my phone and 1 pc…
Unfortunately, when I claim on another device, there was an issue where the reward will not be credited. I think they pause the claim button because of this issue (just a theory)
Issue I’m referring:
https://community.brave.com/t/oops-something-is-wrong-please-try-again-later-brave-rewards-is-having-an-issue-please-try-again-later