I can verify my card works for purchases through this site, but D&D Beyond fails to let me use my saved card every single time. I have to do "add new card" at time of purchase and I enter in the exact same information as my saved card for it to work. I do not understand what the issue is. Has anyone experienced this and/or know what the issue is?

I've had this same issue with my last two purchases. I even deleted and reentered my saved card ,still got the issue .

Only way to make a purchase is to enter card info every time manually.

Encountering this for the first time. Any response from an Admin or Support would be great. 

I've had this issue for a while now. I've resorted to using PayPal for checkout for all my purchases.  Quite annoying 

Same issue here. Tried multiple times to reenter my payment information as a saved card under my account, and can confirm the card works. Entering the information manually did the trick.

I have the same issue!

Sorry to say but that's not the case, I have had the same billing address and payment address since i started using dndbeyond to pay for of the books and just recently this year it also start showing me this error, and i can tell ya that i haven't moved from where i live or changed my info for the payment since  the first time i pay for my 1st book on the website, something is definitely not work and i don't think its from my bank since I just contacted them and we check that all info that was put in has not changed and its correct.