The user of the QuickAdd package to enroll macs after with Mac OS 11 or later is not supported. https://docs.jamf.com/10.42.0/jamf-pro/documentation/QuickAdd_Packages_Created_Using_Recon.html 

You have to either enroll the mac using User-initiated enrollment or through the prestage enrollment.

Thanks.  Oddly, it worked on a 12.5.1 machine, which led me blindly down the path.

Could be worst...could have gone down the old imaging methodology.

If you have been using packages before, just move to user-initiated enrollment as mentioned above.  Thats the easiest transition if you don't have ADE/ABM setup.