MikeD3883's Accepted Solutions

Found the issue. The DelayVirtualizationType registry key had not been set on the golden image for the RDSH Farm (as per the last line of Install App Volumes Agent  ) So App Volumes wasn't ... See more...
Found the issue. The DelayVirtualizationType registry key had not been set on the golden image for the RDSH Farm (as per the last line of Install App Volumes Agent  ) So App Volumes wasn't fully mounting the applications until logon - as designed. After setting the registry key and re-publishing the applications are getting properly mounted at start-up and Horizon is able to find them. *Face-palm*
Found the issue - DelayVirtualizationType registry key for App Volumes had not been set on the golden image, as per the last line of Install App Volumes Agent Subsequently App Volumes was not... See more...
Found the issue - DelayVirtualizationType registry key for App Volumes had not been set on the golden image, as per the last line of Install App Volumes Agent Subsequently App Volumes was not fully mounting the applications on startup which meant that Horizon couldn't find them. *face-palm*