Debugger not working on Apple Watch Series 3

Question

Problem: I cannot get the Xcode debugger to attach to my new Apple Watch

Hardware:

• Apple Watch Series 3 (no GPS)
• iPhone 6s

Where it works:

• Debugger works fine on the physical iPhone
• Simulators work great (both iPhone and Apple Watch)

Things I've tried:

• Restarting all three devices (Mac, iPhone, Apple Watch)
• Formatting and reinstalling iOS 11 on my iPhone
• Unpairing and repairing the Apple Watch (done this 1000 times)
• Completely removing all of Xcode and reinstalling from the app store (deleting simulators, sdks--everything)

Other things:

• I've made sure to trust this computer
• I've started a brand new project just to make sure it's not something in my code.

It shows up in Xcode as a valid target, but when I build it just says "Running App on Jason's Apple Watch." It installs the app, but doesn't start it, and the debugger doesn't hit any breakpoints.

Answer 1

Attempt to attach the debugger manually to the Likely Targets.

XCode -> Debug -> Attach to Process -> Likely Targets -> Your Project

I had this same issue and am uncertain of why this started happening to me. If someone knows how to permanent fix this problem, please feel free to edit this answer.