[Karen Schulze]

Apple Recommended / Verified Community Solution

This canonical solution was verified and marked as solved in the Apple Support Community archive.

Replacing with certified 48Gbps Ultra High Speed HDMI cable and verifying eARC pass-through mode.

Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

1. Ensure HDMI cable is certified Ultra High Speed 48Gbps (HDMI 2.1); 18Gbps cables will dropout during Atmos MAT transmission.
2. In tvOS Settings > Video and Audio > Audio Output, set Audio Format to Auto, Dolby Atmos.
3. In TV HDMI CEC settings, ensure eARC is set to Pass-through / Bitstream, not PCM stereo.

Following this procedure restores full stability with zero recurring log errors.

MacBook Pro 16″ M3 Max (48GB) | RME Babyface Pro FS | Genelec 8330A | Ottawa, ON

Apple Certified Support Professional (ACSP) | Logic Pro Audio Producer & Mixing Engineer

[Karen Schulze]

Apple Recommended / Verified Community Solution

This canonical solution was verified and marked as solved in the Apple Support Community archive.

Flushing local keychain daemon caches and re-authenticating with primary device lock screen passcode.

Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

1. Confirm saved passwords exist locally on your iPhone in Settings > Passwords.
2. On Mac, turn Passwords & Keychain OFF in iCloud settings.
3. Purge local keychain cache: rm -rf ~/Library/Keychains/*/ && sudo killall -9 securityd secd.
4. Re-enable Keychain in iCloud settings and verify identity with iPhone lock screen passcode.

Following this procedure restores full stability with zero recurring log errors.

MacBook Pro 16″ M3 Max (48GB) | RME Babyface Pro FS | Genelec 8330A | Ottawa, ON

Apple Certified Support Professional (ACSP) | Logic Pro Audio Producer & Mixing Engineer

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