A check for Prime Video
Write down the price and offer text shown on the same title page before and after you sign in. An add-on purchase and a rental can sit next to membership access. If a second family profile cannot see the same offer, check the billing and title route on that profile.
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.