Why is my Apple ID not adding a discover card to my payment option

Apple Card as in Apple Card MasterCard, issued and serviced by Goldman Sachs Bank? Discover Card is a credit card. What exactly are you trying to do?

Can you please explain why we cannot use Discover Credit Card as a payment source for Apple ID? I have tried to reset my network settings and that still does not work.

What error message do you receive when trying to add the account information.