I'm definitely seeing some odd behavior. My registry keys don't match the FSLogix Doc (
https://docs.fslogix.com/display/20170529/FSLogix+Multi-user+Search). I have multi-user search enabled in GPO and applied to the OU the VM is in, and am missing the settings from your article (Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Windows Search\Preferences\EnablePerUserCatalog(REG_DWORD)) <- the whole entire EnablePerUserCatalog setting does not exist.
When I check the logs, I am getting this: Error id 26; Error: Configured for Single-user Search, but this is a Multi-user environment (The parameter is incorrect).
And when I check Outlook, it
seems to be indexing, yet I can't find the actual index in my profile (oh, using UPM for profile, and ODFC).
All settings for FSLogix are done via GPO, none directly via registry.