Can't log into Apple TV on Roku Device

Hello Julianseastars,

Thank you for reaching out to Apple Support Communities, and we'll be happy to help in any way we can. We understand you're having issues with signing into the Apple TV app on your Roku device. Try the steps here to see if they resolve the issue: If you can't watch or stream movies and TV shows in the Apple TV app - Apple Support

"After each step, try to stream or download the movie or TV show again.

1. Check the System Status page for service interruptions or check a third-party provider's website for any interruptions. If there are service interruptions, try to stream or watch the video later.
2. If you're having trouble signing in with your Apple ID, you can reset your Apple ID password or learn how to get a verification code and sign in with two-factor authentication.
3. If your cellular connection is poor, connect to Wi-Fi instead.*
4. Try watching on a different device using the same Wi-Fi or cellular connection. If it doesn't work, contact your internet service provider to see if there's an issue with your network.
5. If other people are using Apple TV+ or Apple TV channels, make sure it doesn't exceed the limits for streaming on multiple devices.

* Make sure that your Wi-Fi router is 802.11a/g/n/ac compatible. Streaming HD content requires 8 Mbit/s or faster. Slower tiers of Wi-Fi connections might not be fast enough to stream HD video content."

We hope this helps.

Cheers!