A check for Tubi
Write down the title and episode you found on one screen. Look for that same item using the same account and market on the second screen. If it appears but will not start, capture the player error. If it never appears, check the current catalogue and profile separately.
Check on the intended screen
Open the app catalogue on your actual device and confirm the publisher and region. Sign in only through the service or documented billing issuer.
Keep a title-level test
Use one title, episode or fixture that you can identify. Record whether the app launches, the account signs in and the item plays.