Yes that would be the reason, the prepaid cards don’t support 3DS, although the debit cards will.
Also bear in mind that Monzo is experiencing an outage at the moment so all card payments are failing. You can check for updates here -
Yes that would be the reason, the prepaid cards don’t support 3DS, although the debit cards will.
Also bear in mind that Monzo is experiencing an outage at the moment so all card payments are failing. You can check for updates here -