macOS 12 latest version not showing in software update

This is what I get when the above command is used

softwareupdate --list-full-installers

Finding available software

Software Update found the following full installers:

* Title: macOS Monterey, Version: 12.6, Size: 12104042KiB, Build: 21G115

* Title: macOS Monterey, Version: 12.5.1, Size: 12114929KiB, Build: 21G83

* Title: macOS Monterey, Version: 12.5, Size: 12112497KiB, Build: 21G72

* Title: macOS Monterey, Version: 12.4, Size: 11819688KiB, Build: 21F79

Intermediate Steps will be needed to bring the computer to a more updated version of Monterey.

Terminal again, only this time the below command and again without Quotation Marks

It will download the Full Version of Monterey 12.4 ( about 12.xx GB in size ).

It will place a new application in the applications Folder called " Install Monterey ".

It will No Auto Launch. Just launch the Application like another application and follow the prompts

" softwareupdate --fetch-full-installer --full-installer-version 12.4. "

Once the Monterey 122.4 is installed, hopefully successfully, try the Software Update Applet in System Preferences.

Hopefully if will offer and possibly the 12.6 version in a Normal Way.

If Not, adjust the above command to read 12.5.1 and repeat the process described above

Thank you.

Is this computer Owned by a Company, University or Organization which has Enrolled this computer in a Mobile Digital Management Service ( MDM ) ?

If not - to be honest - have not a clue why this method will not work except if there is some Third Party Software Installed and used on this computer that will not allow any type of Normal or Terminal Update to be performed.

Understand, we are all working Remotely from all around the world. 

Therefore, we do not have the On-Hands experience the User ( you ) has with this computer.

The next best thing for us to having a semi - actual On-Hand experience  with this computer is to follow the steps below

Download the Application Etrecheck directly from the Developer. 

The application is free or paid from added features. 

It will take a Snap Shot -  both the hardware and software.

 The Report will Not Reveal Any Personal Information. 

Post back the Full Report - copy and paste - using the Additional Text Icon ( 3rd Icon to last )

We can have a look at the report for possible issues and may have possible suggestions to resolve the issues.

You can try the previous posters suggestion but do not know if that will work.

In Theory, it should but is a Major Leap from 12.0.1 ( Original Release Version " released Oct 28, 2021 Monterey macOS 12.01 "

Boot into Recovery Mode and reinstall Monterey.

Use macOS Recovery on a Mac with Apple silicon - Apple Support

Can the user ( you ) provide a Screen Shot ( Shift Command 5 ) three keyboard combo of " About this Mac " without the Serial Number

Terminal Application and use the below command without Quotation Marks

"  softwareupdate -l "

What is the output of above command ?

Something is seriously not right here.

Again in Terminal below command Without Quotation Marks

" softwareupdate --list-full-installers "

Output is what ?