Hi. Thanks for asking. I'm using Xcode Version 26.2 (17C52) on macOS 26.2 (25C56) and I was able to successfully install the metalToolchain component using the command you show in your question above and the the commands on this page. Maybe try downloading and installing separately (there are directions on the page above). Also, have you tried on a different network?
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Developer Tools & Services
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Xcode
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