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I have similar issues - I have been trying with three different credit cards for the last few weeks and it is still not resolved.
I tried with a different learning account , still does not work. Tried chatting with pearson vue support - they say they cant help. Tried calling my credit card company - they say the payment is not reaching their gateway. It is something to do with Microsoft only - I was able to book an amazon exam with the same credit card without issues on Pearson Vue
I have submitted a ticket with microsoft now - waiting for them to respond and resolve the problem