Unable to add card to Apple wallet

Hello I can’t add any cards to my Apple wallet it won’t let me and comes up with an error message.

Details to reproduce:
OS:
Device:
App Version:

Screenshots:

Are you trying to add it via the Monzo App or through Wallet? Is this a new card? of so, is it activated?

Without extra info, it’s difficult to say what could be causing the issue, so based on the fact you said “cards” (plural), I’m going to assume you are talking about Virtual Cards.
If that’s the case, then only virtual cards that are attached to a pot can be added.