Power Button won't turn off monitor

I tried the power button lock out suggestions:

Try the below suggestion:

Power Button Lockout is displayed.

The monitor's Power Button Lockout function is enabled.

Press and hold the Power button for 10 seconds to unlock the Power button function.

If the above doesn't work then try a monitor reset.  Unplug the monitor’s power cord and hold down the monitor’s power button for 30-60 seconds. Plug the monitor back in and power it up.

But the monitor still won't power off the power button is not in lockout mode.