See the error attached. Probably down to Adyen. Worth checking?
Not sure if there are going to be regional differences, but I tried adding my Monzo CA card to Grab (Malaysia) and seems to have worked fine.
Grab’s app opened up a “Adyen Validation” webpage which seemed to be the 3D Secure page.
Oh no! Sorry to hear this 
Was this on the prepaid card or the current account?
It was on the prepaid card(beta). Not a problem at all, I have used a back up card. Thanks!
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No worries! I believe they do have a bit of a problem with the prepaid card but it sounds as though the current account works fine 
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