Hi Mike,
Please try restoring the printer to factory setting using the control panel of the printer.
Note: This process clears all of the data stored in printer’s memory and resets all of your settings to the factory default.
Press (Menu) > System Setup > Clear Setting on the control panel, select “Printer Setup”, and restore the printer to factory defaults.
Now check if the option for “Button press” is available under “Wakeup Event”.
If the issue persists, press (Menu) > System Setup > Clear Setting on the control panel, select “All settings” and check the option for “Button press” is available under “Wakeup Event” and switch it on.
Please post the results.