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OMG, this is so awful. I was able to plug in my iPhone directly into my laptop running Xcode and was able to run an app i'm building from Xcode no problem. I then tried my wife's iPhone, nothing. I mean....nothing. Both phones have the exact same version of iOS installed. Rebooting the laptop, rebooting the phone, restarting everything, and still nothing. I keep getting the "Failed to prepare device for development, please unlock and reconnect your device", which I've tried countless times to no avail. How can things be broken so bad?
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This had to do with not having a developer account. The instructions do say you need one, which i missed.
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Running into this with xcode 13 on Monterrey. Shut down Xcode, and the cpu was still being consumed to the point that you could hear the machine. Using top found that a process called "swift-frontend" was the culprit. Did a "kill " and that took care of that.