My bad, I didn’t read your first comment properly, please ignore my earlier advice.
Apparently 3D secure isn’t supported by Monzo. But as far as I know, Monzo’s not confirmed that so I’ll ask flag this post & hopefully we’ll find out 
My bad, I didn’t read your first comment properly, please ignore my earlier advice.
Apparently 3D secure isn’t supported by Monzo. But as far as I know, Monzo’s not confirmed that so I’ll ask flag this post & hopefully we’ll find out