Access to your account is required to see if there is some form of another / different method of verification you need to add. For this you need to contact eBay Customer Services who do have that access.
Contact them now as there's more chance of Dublin answering this early.
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 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.
@phosua15