Buyers who win auctions or commit to purchase but fail to pay.
Buyers attempting off-platform deals or other manipulative scams. blocked buyer list
Sellers typically add a buyer to this list for one or more of the following reasons: Buyers who win auctions or commit to purchase
If you have already blocked the buyer but need to leave a review for a transaction that happened before the block: blocked buyer list
It seems you are asking how to leave a review for a buyer you have blocked, or perhaps you are asking if you can do this.