Hi Jaypea7,
Thank you for reaching out to us in our community and welcome, sorry to hear you are facing issues watching Sky Sports and BT Sports on your device Via TV Go, as advised by newapollo, you should be able to watch BT Via the app however Sky Sports can now only be accessed Via the Sky Sports App.
In regards to registering your Wife's iPad it may be you have already reached tour device limit for this Month, you can find out more here.
You can also find further support around our TV Go App here.
Regards
Paul.