Can’t sign in
Roku 3800X streaming stick not allowing me to sign in on my tv at all with using my cell phone or signing in with my Apple username
3800X
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Verify that the Roku firmware software is up to date.
Verify that the Apple TV app is up to date.
Verify that the home network has a good internet connection with good settings (not blocking any Apple sites).
Try a power cycle of the Roku.
If you did everything right and still can’t sign in, then contact Apple Support. Contact Apple for support and service - Apple Support (phone numbers) or Get support - Apple Support (chat, email, callback). Keep the info of the error message and of the Roku About screen ready to share.