I'm experiencing the same issue. I've followed the newer guide, which you correctly identify as having msiexec parameters explained, but my ASSIGNMENTOPTIONS doesn't work properly. Interestingly it sets the computername to %ComputerName% but applying --group-id=g123456 doesn't take effect. I've also noticed that my auto assignment doesn't work so I assume this is the cause of the group not applying. There's a hidden property listed in the MSI called AssignToToken which I think isn't being set during this process. Does your deployment create the assignment using the APITOKEN correctly?
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