Control puck with a uwp app?

Or are you saying I need to put ** either side of the s?

No, just NRF.setServices

I'd try using the nRF connect app (ideally on Android as iOS has some cacheing issues) and checking that the app itself can see the services first. That way you can narrow down whether it's some issue with the UWP app or with how the Puck is set up.