Hi Question1232,
Thanks for using Apple Support Communities. We understand you're unable to sign into your Apple TV. We want to help. Work through the steps below to help resolve this:
- Restart the Television
- Restart the Apple TV: Restart Apple TV - Apple Support
- Check for any outages here: Apple - Support - System Status
If this continues, let us know if you've been able to sign in previously and if there were any changes made prior to this error happening. We'll go from there.
Thanks.