Hi @Empy, welcome to the forum and thanks for posting.
I'm sorry that your having this problem with the app.
Are you using Android or IOS?
Have you tried uninstalling the app and installing it again as this often resolves issues?
For sure tried many things but like I asked.....
Is the BT app getting info from the BT hub?
If so then thats the problem.
Doing it on special offers/prizes.
Also on 'your bills'.....
Get a glimpse of a page but then 'having problems'......
Think I've tracked it down to a DNS thing.
I use dns.adguard.com in my settings.
Switched to auto and things load up now.