Your customer is on the sanctions list of Western Union: OFAC sanctions list: U.S. foreign sanctions unilaterally impose sanctions on some countries through the Office of Foreign Assets Control of the U.S. Treasury Department (OFAC), which is a unilateral sanction with a wider scope than the United Nations sanctions list. Generally speaking, banks will not accept customers on the list, but sometimes you have to charge dollars. In order not to delay business, you can tell your customers that you can sometimes receive payment by euro remittance.