Why can't I add a second credit card?

I am getting an error that is preventing me from adding a second credit card as payment option.
When I fill out my credit card information and try to submit it, I get the error that follows :
You have reached the maximum number of credit cards allowed on an account.
However, I have only one credit card.
I also tried to remove it so that I could add a second one. But this couldn't possibly work because my account would have no payment method.
Does anyone has an idea of why the system is presenting such behaviour?
Thank you in advance


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