Azure Local Upgraded to 23H2 - Missing all *solutionupdate* powershell commands / module.

Running Dell AX-750 clusters that were built last year on Azure Stack HCI 22H2 out of the box. Followed the MS guides to upgrade the OS to 23H2 successfully on all members of the cluster, even running Invoke-AzStackHciUpgradeValidation passes 100% of the tests. But the last phase where I need to install the "solution update" fails, simply because PowerShell does not recognize ANY of the solutionupdate commands (get-solutionupdate, get-solutionUpdateEnvironment, etc). None of them. I can't figure out how I'm missing this crucial powershell module, and more importantly, how to install it so that I can proceed with completing the upgrade.