SUPERMAN is your answer:  https://github.com/Macjutsu/super

I have been looking at it but the super version only shows 13.4 OS. Maybe I am missing something

Do you have configuration profile restricting Major updates?

Can you see Sonoma via the System Settings on the same Mac?

No major restrictions. I do see Sonoma via the System Settings on the same Mac

Ok, that could be a super configuration.

Best check the Mac Admin Slack

Why can't it just update to MacOS 14.0 by itself and not just stop at 13.6?

Read the SUPER Wiki Documentation.  Upgarding to new OS is covered:  https://github.com/Macjutsu/super/wiki

ok the only thing I am seeing is to run locally but I will continue to review. 

I went through it and not sure what I am missing. It still gives the user the option to update instead of just updating the user on its own.

Also as mentioned... check in the MacAdmins SUPER slack channel.