Can’t pay in Vietnam

Hi, I am having trouble using my revolut card in Vietnam. In Hanoi it went well, but ever since I left that city I haven’t been able to pay (with the pin or magnetic band) in anyplace (hotels, restaurants, cafes) both in Hue and now also in Hoian. The terminals just don’t recognise the card and ask to « remove the card ». I can however rethdraw money from the ATM, but cannot use it at all for any payments. Anyone had the same problem?