I signed up for HBO Max on TV #1 with Roku no issues. When I select HBO Max on TV#2 it recognizes my subscription and asks to sign in by phone or computer . When I do this it prompts for my internet provider, which then says "can't very your subscription" because I didn't buy it through AT&T. I don't know how to make it work on additional TV's. The other option is to sign into HBO Max which I don't have an account with them, it's through Roku. There is no way around this activation sign in. How do I correct this?