Hi Beejer52,
We appreciate you reaching out to us.
Based on the details you initially provided, it does sound like a TV-related issue.
However, we’d like to gather additional details that may help so we may take a closer look into the issue.
What does the error message say? Does it say that your password is incorrect?
If no, it could be a connectivity issue or an app issue. Disconnecting and reconnecting to your home network may help. If possible try a wired connection. Removing and reinstalling the Apple TV app may also help.
If the error message indicates that your password is incorrect, please try a different Apple ID to test with.
If you get another error message that indicates that your password is incorrect when using a different account, please reach out to the TV manufacturer for further assistance.
If you managed to sign in to the Apple TV app using a different account, please reach out to us using the support link below so we can take a closer look into the issue.
Get Support
Take care!