Like many Xcode defects, this has been around for a while. If you are reading this now, consider yourself lucky you have not hit this before. See Stack Overflow for more bread crumbs, unfortunately no root cause hence no reliable workaround yet. https://stackoverflow.com/questions/52421999/xcode-10-command-codesign-failed-with-a-nonzero-exit-code
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Developer Tools & Services
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Xcode
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