Dtv stream choice not working with ballys sports north

I just canceled xfinity because I was told direct tv stream was the way to go to watch my ballys sports north. Well I'm signed up for choice package and on my free trial right now. I cannot watch any ballys on direct tv stream at all which is on my firestick. It says to view I need a desktop box. Are you serious? Please help, I'm connected to my home network and on my home tv.