Author Peter Hicks Posted on Thursday 3 November 2022 Categories Uncategorized After a second or two, an entry for Microsoft Defender will reappear, and should have full disk access toggled on if it hasn’t already.įor some reason, the second time I did this, the Security Extension didn’t appear, but if it does for you, toggle that on. The fix was really simple – click on Microsoft Defender in the preferences pane and click the minus button, then repeat this for Microsoft Defender Security Extension. mdatp health to the rescue, which reported “Full disk access has not been granted”, so I knew I was on the right track.

The error message in Defender wasn’t helpful, and I wondered if it was bringing up the Full Disk Access pane instead of another pane. Surprisingly, the only casualty of the upgrade was Microsoft Defender, which came up with a warning triangle and a suggestion I click ‘Fix’, bringing up the Full Disk Access page of System Preferences to do… well, something. I use my Mac Mini far less than I do my MacBook Pro, so I decided to upgrade without a fresh install, something I very rarely do.

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