Left-Option key no longer works after upgrading to Ventura 13.2

Noah Wallach wrote:

here is another data point. The left option key (and right option key too) of external apple keyboard connected to the MBP works just fine.

Usually an external keyboard working fine means the internal one needs repair.

Click the Shortcuts… button at the bottom.

In the Mission Control Shortcuts, you can set the Option keys as a shortcut.

Thanks - I was able to find the Mission Control Shortcuts section and did not see the option key chosen. Also I did not see the option key chosen in the System Preferences Keyboard Shortcuts.

Even if the option key was a chosen option why would the right option key continue to work while the left option key no longer works? Does the Mission Control Shortcuts or the keyboard shortcuts even allow the choice of a just the left option key?

Yes, you can choose either the left or right Option, Control, Shift, or Command keys.

You could try setting the Left Option key as one of the shortcuts, then change it back to the default (note that before changing it). I don't know if it will fix the problem, but I don't know of anything else that would disable the option keys.

Look in the Mission Control System Settings to see if it set for one of the options.