Monzo doesn't accept my card

Hi, I’ve read that usually debit card from Italy get accepted as a payment method but mine doesn’t seem to quite work on Monzo. I’ve tried to send several times money to a friend of mine that lives in the UK, but I can’t apparently do it. It’s Mastercard and if I can provide more useful informations to check if that’s a bug or to know what is the reason, please tell me, I would greatly appreciate some help on the matter.

You are sending less than £100 to their address?

How are you sending it?