Jan 14 2021 08:21 AM
So I've run into this bizarre issue where most of the time when I try to add a session host to an existing WVD host pool, deployment fails with "OS provisioning for VM %Myhostname% failed. Error details: This installation of Windows is undeployable". This happens if I try to deploy two or more hosts through Azure portal.
However, after about a day I'm then able to add a single session host to the same pool with the same image version from the same SIG.
I wanted check if the image was sysprepped correctly, and stood up a couple of standalone VMs using this image - no issues whatsoever.
I also set Image replica count to 3 and Storage account type to premium SSD, thinking perhaps the storage didn't have enough throughput to handle more than one installation but received the same error.
Jan 15 2021 10:03 AM
Solution
Never had this but it sounds like maybe your image in the SIG maybe corrupt? Have you tried creating a new SIG and see if that helps? Also what happens in your source region that the image originate from, do you get the same problem?
Jan 27 2021 10:18 AM
We had to restore an older backup of the VM used for building the image and that one was still intact.
Still, I was quite puzzled why would I be able to create a regular VM without issues only to be be greeted with an error while deploying a WVD session host from it.
Thank you for the response.
Jan 15 2021 10:03 AM
Solution
Never had this but it sounds like maybe your image in the SIG maybe corrupt? Have you tried creating a new SIG and see if that helps? Also what happens in your source region that the image originate from, do you get the same problem?