I had this same problem because I have two first names. What fixed it for me was creating a new person who will fly on the new ticket I was purchasing with the first name of my first name and my last name, then I applied the credit with the same first name and last name as well as confirmation number, then afterwards switched it back to my real first name and last name. For example if my name was Mary Grace (first name) Smith (last name) then under the who is flying section I entered first name: Mary, last name: Smith. In the apply credit section I put, confirmation number, first name: Mary, last name: Grace, then once the credit was applied I switched it back to my correct ID info: Mary Grace Smith. Hope this helps!
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