Fix Guide: Sequoia iCloud Advanced Data Protection Setup Failures

Symptom: Attempting to enable Advanced Data Protection (ADP) on Sequoia results in an "Internal Server Error" or "Verification Failed" message during the recovery key setup.

Why this happens

Sequoia requires all devices on the account to be on a minimum OS version, but sometimes cached "ghost" devices from the account prevent verification.

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Fix 1: Clear the IDS (Identity Services) Cache

1. Open Terminal.
2. Run the following to reset identity services:

sudo killall -9 identityservicesd

1. Try the setup again.

Fix 2: Sign Out and In of iCloud

1. Go to System Settings > [Your Name] > Sign Out.
2. Choose to keep a copy of data if prompted.
3. Sign back in and attempt to enable ADP again.