A dormant account suddenly being used after a long break for selling raises red flags to eBay as it could be a sign of the account bring hijacked so therefore proof, ID proof , that real owner of the account has returned is needed.
You'll need to contact Customer Services explain the issue, they'll hopefully advise the ID you now need to show if the usual proofs are not in your possession.
I do strongly recommend contacting CS first thing in the morning when the lines first pr for ' Live agents'' as there's more chance of Dublin answering and understanding the ID proofs we have here.
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.
@princessde