Tag not monitored by Microsoft.
I am having the same issue for 3 weeks now, not only Pearson Vue handled nothing but they blocked my account at first after I tried many attempts with different cards, and somehow after calling the customer service which is not free btw didn't fix nothing at all, and took all my money I had on my phone, after I escalated things in the live chat they managed somehow to unblock my account but I didn't get a refund about the money they wasted.
Anyhow I continued to make the payment first at home for several times and the same issue the card issuer is the problem, contacted them like all the comments nothing came through to even reach to the attempt let alone payment.
But then I tried to select to take the exam into a test center and the payment went through, I cancelled that schedule and now I am trying to schedule the exam at home with the SAME CARD and the payment is not going through!
I don't know what the issue is or how to fix this but I need a solution ASAP.