software update claims I am not an owner

Is this a New Issue ? If Yes, what exactly changed on this computer ?

Is this an Old Issue ? If Yes, what actions has the user taken to fix this issue ?

Details and context will really help to pinpoint possible solutions.

Any Third Party Applications that will interfere with the normal operation of the OS, alter, modify, remove or delete or attempt to do so is an invitation for disaster and may require a Reinstallation of the OS.

This includes AntiVirus, Disk Cleaners, Disk Optimizes, UnInstaller etc.

This will include CleanMyMac 

This will include BitDefender

The The Built in Security  is all that is required.

I have a ManBook Air M1 and have had this problem with every update. Uninstalling CleanMyMac does not work, I had to go into recovery mode and install the OS, which then was properly installed. While I've had Macs for years this is the first time I've run into this, If continuing I'll probably reassess owning Macs.

Ouch - corruption of Admin Account.

The previous contributor @lllaass is much more expert on re-enabling or creating a New Admin Account on the existing installation of Monterey - it he / she picks up and continues to assist.

Best of luck

What should I do?

See these previous discussions:

failed update - message says "You need to… - Apple Community

Mac OS Monterey 12.1 update - Apple Community