YOUR ENROLLMENT SERIES HAS BEEN CANCELLED DUE TO INVALID PAYMENT INFORMATION
The mint system has a big bug!
At a point last year the mint said my exp 6/21 card was expired for the 5oz enrollment.
So, I added an exp 12/23 card. And, deleted the exp 6/21 card.
When I logged in the website, sometimes, it said the card was expired, sometime, it did not say it.
But there was no problem when I bought coins. It seems the bug only exists in the enrollment part.
Just now I received email, saying "Your enrollment order, which included a product due to ship tomorrow, has been cancelled because of a problem with your credit card."