Okay, are you able to at least see your vouchers and other credits? I currently have a $5 credit applied from a cancellation dispute so I think it should be working for all credits.
Just figured I should reply here as a follow-up. I had a friend see my comment on HN and reach out to me directly. I found out I had enabled some option somehow that disabled the use of credits. I fixed it, and now everything is working correctly.
