I have an AppleTV 3rd generation (A1469) that will not login to iCloud. After entering the correct password I get
"Unable to sign in. Could not communicate with server".
If I try the wrong password, it gives a different error saying wrong password. My account has 2FA enabled. I've read unofficial forum posts saying you need to use a "decorated password" which is your password plus the 6 digit 2FA code appended. But in this case my iPhone does not show any notification about a login attempt. I've already tried "Reset all settings" in the menu and it's running the latest OS 7.3. Network test does not identify any problems.