vpn connection problem

I cannot log in to my VPN account that I purchased on iOS from the desktop browser. When I enter my email into the premium account, it appears that I have not purchased any plan. Also, when I want to connect an account from iOS to the purchased membership (Whoops! Something went wrong with linking your account. Please contact Brave Support See full error {“type”: I am getting “GENERIC_ERROR”, “message” :"Bad client request: 400 Bad Request null”) error, please help.