Could you be more specific and let Brave know what kind of message you are getting?
If you are getting “region not supported” then it is because your country is no longer supported. Brave is working to bring most countries back.
You an follow the development in the following post.
If it is a different error message, then I suggest you to open a support ticket. But please provide as much details as you can, and be very specific about the steps and the errors your are getting.