I was having the same problem, for me the fix was to enable Developer Mode on the iPhone.
While making the change, I had my iPhone connected to the Mac using USB cable, not sure if that is required though.
On the iPhone change dev mode. Settings --> Privacy & Security --> Developer Mode = ON
The iPhone had to go through a restart, as soon as it restarted Xcode found the iPhone is sync'd and all seemed to work OK.
Topic:
Developer Tools & Services
SubTopic:
Xcode
Tags: