A check for Paramount+
Record who billed the subscription and which app you are trying to open. If you subscribed through a partner storefront, confirm whether the purchase includes a separate app sign-in. A wrong sign-in route can look like an expired plan while access still works where you bought it.
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.