Fixing a Broken Migration Assistant Clone on macOS Tahoe
Date: 2026-02-10
Host: new Mac (macOS Tahoe)
Context: Migration Assistant clone from older Mac failed
SecurityAgent was unable to create requested mechanism TeamViewerAuthPlugin:start.
Summary
First day using macOS Tahoe, immediately greeted with a broken Migration Assistant clone from an older Mac. The system failed to reach the login window due to a corrupted SecurityAgent authorization plugin left behind by TeamViewer. This caused login to fail and wedged Setup Assistant in a deadlock during post-migration initialization.
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