You'll need to contact eBay Customer Services for this. They may tell you which item (s) are involved though be prepared that restrictions are often not discussed or explained further than any message you've received.
To Contact Customer Services I recommend using the link below for a Call Back option, and call as close to 8 a.m. on weekdays as possible, as there's more chance then, of Dublin answering.
https://www.ebay.co.uk/help/eua?id=5190
Lines open between 8 a.m. to10 p.m. on weekdays.
9 a.m. to 6 p.m. on weekends
Automated assistants are available outside these hours.
@salty_surf_sales