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For the last few days, my Apple TV keeps showing an authentication code pop up for ten-ish seconds and then disappearing. I live in a house and unless neighbors 200 feet away can connect to the tv, nobody else on our network is trying to connect either. I can’t figure out what it is, and even after factory resetting and exchanging for a new one it is still happening. I also removed it from Apple home, nothing. Turned off STP on the port too. Turned off AirPlay, and then also limited to anyone on internal network. And we don’t have homebridge.
TLDR; authentication code keeps popping up even though nobody is trying to connect to tv. Help!
If you hold down the Menu button and the down arrow on the remote for 10 sec until the LED on the front of the Apple TV begins to flash. Let go of the buttons and the Apple TV will do a soft reboot.
This has been happening to me several times a week and doing this seems to fix the issue.
I fixed mine by just going back to the stv menu and trying to play it again.
In my case I was streaming the content from my iPad.