Can't click Allow when System Extension Blocked

If clicking the Allow button does not work when trying to enable a System Extension, try this:

  1. Open Keyboard System Preferences.
  2. Enable Full Keyboard Access (All Controls) on the Shortcuts tab.
  3. Open Security & Privacy System Preferences.
  4. Use the tab key to highlight (outline) the Allow button.
  5. Tap the spacebar to activate the Allow button.

Note: I found this in a post several months ago (perhaps a year). However, I haven't been able to find that post again. If someone know where it originated, post the link in a reply here and I'll link to them for credit.

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