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So after a bit more digging it seems that the az command internally just sets a storageProfile on the cluster like so
```  "storageProfile": {
    "blobCsiDriver": {
      "enabled": true
    },
    "diskCsiDriver": {
      "enabled": true
    },
    "fileCsiDriver": {
      "enabled": true
    },
    "snapshotController": {
      "enabled": true
    }
  },```
There are many profile options available on the ManagedCluster resource like `AgentPoolProfiles`, but no StorageProfile, so maybe it is just not supported?