Since yesterday I can’t pay my revolut card by contacless. First it happened in a store, but I could pay using PIN number, the worse was when I wanted to use undeground. My contactless was rejected, and I had to by oyster card (5 pounds) and top it up. Insted paying only for my trip like I have been doing since a couple of months (always revolut card) I had to spend more money. It is useless to use revolut card as your main card when theses simple problems occured suddenly.
Is contactless enabled in your security settings?