I have installed Nuki on both my iPhone and Apple Watch, which where working just fine. I had to re-install my iPhone though after repair and now Nuki is only working on IPhone and not on my Apple Watch anymore. It says: add your first Smart Lock on your phone (but I have done that already). How can I solve this? Thank you!
Try to reboot the watch.
If this does not help, remove the watch app, reboot the watch and add it again.
It works!!! Stupid I didn’t think of that… thank you!