That’s your issue. You need to update your passport/ID to show you’re in a supported region. Otherwise API is telling Brave that you’re from Germany, which is not a supported country.
Wrong, kind of. Uphold and Gemini go by different info, but Brave is stricter and needs the API from them to inform that all of your information matches. When it sees a passport from Germany and other information from France or Austria, it sees it as an issue. It’s easy to use a friend or family member’s address to claim as your own or to have something registered to an abandoned property where you pick it up. Faking address is incredibly simple. Hence why it goes by the more official government ID that needs to make sure it’s showing, in addition to that. It’s a way to avoid fraud/deception and to make sure Brave is abiding by government regulations.
The reason why I say “kind of” is because you’re right that you don’t need to have citizenship for the country. But you will need a valid government photo ID showing your residence there. You can get things like a driver’s license, which would be accepted. This could be a passport, national ID card or driver's license