Thanks for the suggestion. I have the same problem. It used to work but no longer. (I fly AC regularly, and in the past couple of years, none of them have been credited automatically, so I have been a bit of a regular user of the form..)

Tried the app, it ask for a "Voucher number". Not sure what that is, so just put 0. Any other suggestion?

The app keep saying "We are unable to process your request. Please try again later" (MS-MS038066034). Not sure if this is temporary, so will try again later...