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I have seen this issue sporadically on our environment, the VHDX stay attached to the server. If you are using AccessNetworkAsComputerObject the lock file owner is the server currently using the VHDX so you can script a close SMB handles/lock file deletion so the user can start a new session. Add an extra layer of security with maintenance mode if using Citrix as it’s not a healthy sign for the VDA.

It’s weird cause I didn’t see any SMB handles open under local admin. If I tried to detach it through Comp Management it would reattach immediately. Ending up deleting the FSLogix session key, detaching the disk afterwards, then deleting the lock file from the share. Hopefully this works for the user when the login next time. We put the VDA into maintenance mode and will reboot tonight.