FR Hi! I think they tried different kinds of transactions, some were payments and some were more like pre-approvals? The merchant(s) were unknown to me, some Hilton hotels in South America. I hadn't enabled auto cvc but now I have for all my cards.
I must say that I am using Bunq as my primary bank for many years now, and I'm very happy doing so. I share this experience because it's actually un-bunq-like, so I think they want to know and handle it better than other banks.