07-01-2021 2:48 PM
Sellers can block bidders for a number of reasons including buying too many items too close together.
You may have set your account too tight.
Alternatively you can add that specific buyer to your exemption list, so they can bid on the item.
https://offer.ebay.co.uk/ws/eBayISAPI.dll?BuyerBlockPreferences
https://www.ebay.co.uk/help/selling/resolving-buyer-issues/blocking-buyer?id=4082