Hello, you are not alone, I am experiencing the same issue. I have not found a solution yet.
Overall the rest of tutorial worked for me, sometimes I needed to run the app in Simulator, like, for navigating between list and detail views on the watch app, the Canvas just gave me a white screen.
I found one typo in Step 6 of "Creating a watchOS App".
> Select the WatchLandmarkView.swift
Should be WatchLandmarkDetail.swift
I've got the same issue. It's an issue with the WatchOS 6.1 simulator. Try running your code against the WatchOS 6.0 simulator, didReceive on the NotificationController should run properly. When you run on 6.1, the didReceive function is never fired.