Apple TV not recognising iCloud account name or password
Recently my 3rd Gen Apple TV has stopped accessing iCloud. I have Reset, hard reset, put in recovery mode, and put back to factory settings. Nothing has helped. I have changed the iCloud password to see if it was that, but still no success. I input the apple id, the password and the two factor code and it just states that alternatively iCloud is unavailable or my account name is not recognised.
I can access iTunes stores via the apple TV, but I cannot log into iCloud or home sharing using the same apple id. I read past experiences which pointed to turning off two factor authentication but that is no longer possible so therefore is not a solution I can use.
Any suggestions?