First, you should communicate with the customer about the specific situation and reassure them that it is not easy to place an order. You should try to satisfy the customer as much as possible within your affordability, because returns are very troublesome.

If your product has undergone formal CE certification as required, but due to omissions, carelessness, etc., the copy of the CE certificate or the electronic file of the relevant certificate was not submitted to the customs during customs declaration, then you only need to provide a copy of the CE certification certificate.

If your CE certification is incomplete and is blocked, you should communicate with the buyer immediately to see if they have a way to deal with the problem. Because many buyers have such customs clearance capabilities, if the buyer can handle it, you can directly entrust them to do it. Of course, you must also give customers certain benefits, and you will bear the expenses incurred during this period.