The unsupported region thingy is more from Brave’s side than from Uphold / Gemini. So if Turkey is not listed at
https://support.brave.com/hc/en-us/articles/6539887971469-Supported-regions-for-verifying-Brave-Rewards-with-a-custodial-wallet-provider-
Then, Turkey isn’t supported. That’s all.
You will get more updates / details at