Your region isn’t supported and it likely will be a long time before it is again. They stopped allowing Philippines and Vietnam to link to Uphold or Gemini back in January. I’ll be shocked if you are able to link to either any time this year.
NOTICE: New region restrictions on verifying Brave Rewards with Gemini
It’s also not on the list at the countries below: NOTICE: New region restrictions on verifying Brave Rewards with Uphold