This is a known issue that can occur after a password reset, where the old credentials get cached. Here are a few steps that have helped others resolve this:
1. Sign out of Apple ID system-wide: Go to System Settings > [Your Name] > Sign Out, then sign back in with your new password.
2. Reset the TV app credentials: Open Keychain Access (Applications > Utilities), search for "Apple TV" or "iTunes", and delete any related entries. Then try signing in again.
3. Clear app data: Quit the TV app completely, then go to ~/Library/Containers/com.apple.TVShows and clear its cache folder, then relaunch.
4. Check Apple ID status: Visit appleid.apple.com to confirm your new password is active and no account alerts are present.
5. Restart and retry: A full restart of your MacBook Pro after the password reset sometimes allows the new credentials to propagate correctly.
If none of these work, contacting Apple Support directly at 1-800-MY-APPLE may be the fastest resolution path since this could be a server-side authentication issue tied to your account.