I can't see what's wrong with my details.
I have just removed the 'Mr' from the name on the account, as there is no Mr on the card. Perhaps it is that. This is my second success at getting a 3080 in the basket and then being declined at the checkout.
Exactly the same for me, I cannot see any difference given billing details != the name on the card so should be my full name. My bank lists me with my middle name in the app but they do not have a middle name provision for the retailer. Live chat was no assistance, can't tell me where I've gone wrong and after a 4th try it left my basket completely. Very frustrating. They could at least highlight to you the difference. I suspect their method for checking is not very robust.