What are you trying to buy? If it's any type of bladed item, and some eBay loosely class as bladed , such as letter openers even cake slices, you need a credit card on your eBay account. Add one see, if that helps when purchasing.
If not, contact eBay Customer Services as some further verification of your bank account may be needed.
This is the easiest and quickest way to contact eBay Customer Services, for a Call Back option.
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
Lines open for ' live agents' 8 a.m. - 10 p.m. on weekdays
9 a.m. - 6 p.m. on weekends.
Automated agents will be available on chat outside of the above hours.
I recommend contacting CS first thing in the morning as there's more chance of Dublin answering.
@thegoodpet