Thank you for reporting a bug to Unity.
We have reviewed the issue carefully, and in this case, the team is unable to prioritize fixing this bug. Here is some additional info from the team: This is probably caused by the Unity Player Account login code - which opens up a browser window (iOS, Android, Desktop [ Win / Mac ]). This probably can't be supported on tvOS.
Today we will be closing this case. Thank you again for taking the time to report this issue, and please let us know if there is anything else that changes the impact or severity of this issue.