XCode 12.5 unable to deploy to phone with watch paired - Device "(null)" isn't registered in your developer account

Question

I have an App groups project that deploys an iPhone app with Apple Watch extension. The project was working in prior versions of XCode. I have re-launched the project after a few months and find that I'm unable to run it on device. Clicking register crashes XCode.

How do I fix this device error [Device "(null)" isn't registered in your developer account ]?

Answer 1

This might be related to the annual device refresh. The steps below helped identify that it was the apple watch device which was causing the issue.

• Went to developer.apple.com
• Navigated to devices tab
• Observed yearly device refresh prompt
• Erased all previous devices
• Went back to XCode, restarted, got same error
• Went to Window > Devices and Simulators page
• Selected iPhone, right clicked
• Selected "Provisioning profiles"
• Deleted all profiles using - button at bottom left
• Re-ran project, observed the proper device name appearing
• Clicked register, project built successfully