I do not see this, it always direct-charges my Amex. The only credits I get auto-spent are my $15/monthly Amex credits. Definitely will reach out to Support at some point (whenever I get fed up and have time to burn, probably while sitting waiting to board a flight).
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.
