Keep getting Upgrade Messages when I already have the pack

[Slowprop]

Not a problem before, but suddenly can’t watch BT Sport on my iPad, either through the BT Sport app or the Sky Go app. I get a pop up saying I have to upgrade to the BT Sports Pack to watch the live channels, but this is what I’ve always had, and the call centre confirm there is no problem with my subscription. 
Only a problem since taking my iPad on holiday, works fine on the sky box.

[DarrenDev]

As per your other thread, this is an issue with your broadband IP address. The mobile apps behave slightly different to the Firestick in this same scenario.