Did it work for someone?
We actually heard that not all the tries and cards were successful with MAV system, but maybe it makes sense first of all to call your bank and ask about this specific transaction, so you would definitely known whether it's you bank might be blocking somehow the operation or it's fully responsibility of MAV with their system. If it is MAV, then probably your best chance will be just email them directly about the issue, they definitely will have more reliable answer than our guesses.