Apple Pay not working on refurbished iPhone SE 2020 after adding new bank card

I recently bought an iPhone SE 2020 (refurbished) and my Apple Pay initially worked fine on the refurbished phone (about 2 weeks) - Then my bank sent me a new debit card which I duly loaded on to Apple Pay from the banks app . This has not worked on Apple Pay at any stage, but the physical card does work on point of sale contactless card machines. I tried deleting the new bank card from Apple Pay and reloading - I have also tried deleting the entire Apple Pay app and reloading then adding the new card but still the Apple Pay contactless feature will not work. I tried also using another bank card to test that it wasn,t something at the first bank card's end - but to no avail the other bank's card also failed to work on Apple Pay . I am loathe to do a complete factory reset but may have to resort to this . There are messages about the phone being associated with a different apple account and mentions a time limit of 90 days and has options to 'Transfer' or 'Cancel' - I have pressed both of these. Any suggestions gratefully received

[Re-Titled by Moderator]