Folks, I noted the same issue, once I upgraded to Xcode 12.0 (and now 12.0.1). I'm seeing the same situation with a custom app I had the Sign In With Apple ID operation working on when using a previous version of Xcode (i.e., 11.x). Note: that I have also don't have any success when trying to install additional simulators into Xcode 12.0 or 12.0.1. When I install my custom app on a physical iOS device, it knows that I've already used the Sign In with Apple ID operation, and skips over the Onboarding operations I need to test. Hence, I need to use a simulator-based iOS devices to test my Onboarding operations... Any suggestions would be appreciated.
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@jldb I had a similar problem in Xcode 12.3 when working with one of my projects. Basically, the Debugger would not Stop on the Breakpoints I enabled in the gutter in one project, but it worked fine in other projects... I finally checked the Project Scheme and noted that the project with the problem did not have the "Debug executable" checkbox selected. Once I checked this box the Debugging operation worked normally. I hope this post helps anyone with a similar issue.
Cheers,
Mark