macOS Tahoe breaks login keychain migration on Secure Enclave Macs

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Manually copying login keychain files between Macs no longer works on machines equipped with a Secure Enclave running macOS Tahoe. The change affects a long-standing method IT administrators and users relied on to transfer credentials when setting up a new Mac. The Secure Enclave's hardware-bound encryption is believed to be the reason the copied keychain files cannot be read on a different device. The issue was documented in a blog post published on September 8, 2026. Users and admins affected by this change will need to find alternative credential migration methods compatible with the new security architecture.

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