I did test it quite a bit, but it seams not possible to connect with the Apple Watch without the iPhone to the Nuki Opener.
With the iPhone, the connection is fine, so my bridge works fine.
When I turned on “Plane Mode” on my iPhone and open the Nuki App on the watch, the watch connects to the Smart Lock, but can not connect to the Nuki Opener.
Is it a known issue and will it be fixed in a future update?
I mainly installed the whole setup to go running without a house key, now have to turn on permanent mode on the Opener, which really is a shame.
Edit: it is an LTE Watch