Fix or Patch for iMessage sign-in loop after macOS Tahoe update

iMessage Sign‑In Loop After Update

After the update, iMessage began repeatedly signing me out:

• I sign in successfully
• Messages loads briefly
• Then it signs me out again
• Loop repeats indefinitely

Other Apple ID services work normally.

Troubleshooting attempted:

• Sign out/in
• Restart
• Safe Mode
• NVRAM reset
• Rebuilding Messages database
• Toggling iCloud Messages

None of these stopped the loop.

This appears to be a post‑update authentication token issue in macOS Tahoe. The system accepts the login but fails to maintain a valid Messages token, forcing a logout.

 System Snapshot Check (to confirm install state)

diskutil apfs listsnapshots /

Snapshot for disk3s3s1 (1 found)

Name: com.apple.os.update-326E9088-A794-4235-AA29-372D5556E911

Only one system snapshot exists, which suggests the system volume was cleanly installed, but the Time Machine drive was auto‑converted during the update and its directory structure was damaged.

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Summary

• The Time Machine drive’s APFS container and snapshots are healthy, but the root directory was damaged during Tahoe’s automatic Time Machine conversion.
• macOS Tahoe removed all snapshot‑mounting and snapshot‑restore commands, so the backups cannot be accessed through built‑in tools.
• iMessage repeatedly signs out due to a token refresh failure introduced in the update.
• Both issues began immediately after installing macOS 16.