I think it needs to be a pos terminal in a shop if I remember correctly.
When I got my card I changed pin in app and had to go to a cash machine and use the new pin to update the chip. I then had to use it in a shop to activate contactless.
@jojingles - It must be a sales transaction with your PIN, in a shop for example. A withdrawal or balance enquiry from a cash machine does not activate contactless payments on the card.