Are you trying from desktop or mobile? I had a similar issue when trying to buy from mobile some time ago, doing the purchase from desktop solved the issue though...
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Born in Italy, moved a bunch, living in Spain, my heart always belonged to Roleplaying Games
I tried to subscribe and purchase a book but it would not take my payment. Tried CC and PP.
Is the Marketplace broken?
Are you trying from desktop or mobile?
I had a similar issue when trying to buy from mobile some time ago, doing the purchase from desktop solved the issue though...
Born in Italy, moved a bunch, living in Spain, my heart always belonged to Roleplaying Games
Desktop
Sorry if I can't help you much, but maybe the only thing to do is to contact support: https://dndbeyond.zendesk.com/hc/en-us/requests/new?ticket_form_id=602788