Maybe its possible to do an elevated Task - Logon Task to run Powershell a Script to add the needed "layoutmodification.xml" File in to Default User Hub before User Data is imported.
Powershell command: "import-startlayout" (Elevated)
"C:\Users\Default\AppData\Local\Microsoft\Windows\Shell\LayoutModification.xml"
try to open the AppVolumesManager Console from the VM you get the ERror Code from in a Browser.
If that works, there is at least a connection and you can exclude that.