Prestage Ignoring Minimum required macOS version

Do you have this allowed (unchecked) in your prestage?
 

No we have that checked off.

Curious - how do you know what’s installed at runtime? Also, I bet it has something to do with the BSI - probably something from Apple requiring the BSI. 
 

So if you can find one that has 26.3+ and try to enroll it and see what happens, then you’ll know. 

I pulled out a new M4 MacBook Air from last year which I updated to 26.4.1 and it does not prompt me to update the macOS to 26.5.1 at enrollment so I am suspecting it’s something in the properties of those new M5 Airs. 

BTW what is “BSI”?

Maybe a Jamf bug? Are you able to just test 1 Mac for Latest version based on computer elgiblity. 

 

Apple Background Security Improvements:

https://support.apple.com/en-us/126604

These Macs are on 26.3 so it may be a property of that specific macOS.  I should download that specific installer and try it on a non M5 Air.

I just got word from our Apple TAM that 26.3 could have been a build that was tagged to have a mandatory update. 

In fact, I am unable to download this build from Download Full Installer.

Like I said, pretty sure the BSI is what is doing it….