I apologize as I gave you a wrong answer. I’m not sure what I was thinking in my response. The truth is Switzerland is currently not one of the accepted regions for Gemini. Yes, you can have a Gemini account and use it, but they are not permitting Brave to connect. You can see a list of accepted countries at NOTICE: New region restrictions on verifying Brave Rewards with Gemini
With Switzerland not being listed there, that means you would not be in a supported region for Brave (in terms of connecting to Gemini). Again, I apologize that I spoke incorrectly as I should have caught that and immediately answered as such when you mentioned.