Asking for pin entry on Samsung Watch 6

I have a Samsung Watch 6 connected to Samsung Note 20. For some days now, if I swipe the watch face, it shows a numeric keypad on the watch and asks for a pin. Bezel movement is ignored. It is obviously some setting that I have played with. But searching for "lock", "unlock" and "pin" in the Wear App -> Watch Settings does not reveal anything useful. From memory, the only recent changes I have made is to enable Google Pay and loaded a visa card. But I can not find any settings for wearables on Google Pay.