Insignia Roku TV. I removed account then added it. I used "sign out everywhere" and re-signed in. I read the info on Roku problems signing in with the warning some TVs aren't supported. Mine was not listed as one of the unsupported ones. I tried my Iphone Roku app to sign in. Still "Account already in use".
My account is not in use. It does work on my tablet, computer and Iphone when I try it. Is there a 3 device limit on Spotify Premium possibly?