Work-around found:
I could only solve this issue by creating a WatchApp together with a (dummy) iOS companion app. I guess this must be a bug in Xcode.
rzumbuehl
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
From
Merlischachen, Schweiz
Post
Replies
Boosts
Views
Activity
I found out that the issues is related to the Watch App Widget Extension. If I’m building the app without the Widget Extension, I’m able to install the app.
I'm using the default setting when creating and activating the Widget Extension (don't include Configuration App Intent and activate Widget Extension scheme).