Fix Guide: Sequoia Keychain "Access Denied" for System Apps

Symptom: System apps like Mail or FaceTime repeatedly prompt for the login keychain password, but returning the correct password results in an "Access Denied" error.

Why this happens

A permission mismatch in the ~/Library/Keychains folder prevents Sequoia from verifying the security token of the calling system process.

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Fix 1: Repair Keychain Permissions via Terminal

1. Open Terminal.
2. Ensure your user account owns the keychain directory:

sudo chown -R $(whoami) ~/Library/Keychains

1. Restart your Mac.

Fix 2: Reset the Local Items Keychain

1. In Finder, go to ~/Library/Keychains/.
2. Find the folder with a long name (UUID).
3. Move it to the Trash and restart immediately.