MGM+ subscription outside of AppleID
I have a subscription directly to MGM+. I downloaded the MGM+ app to my AppleTV. When I go to sign in with my already existing username and password with MGM+, AppleTV keeps asking me to sign with my AppleID. I do not subscribe to MGM+ through Apple, so why does it keep asking me this?
I have already unplugged the AppleTv and plugged it back in.
Apple TV HD