An AVD bug has been recently fixed by microsoft. What the flaw did was to block various Azure Virtual Desktop devices, not letting them downloading and running the monthly updates. These are normally done via WSUS (Windows Server Update Services).
What Was Impacted?
The following platforms were impacted:
Version 1909 of Windows 10 Enterprise multi-session Version 1909 of Windows Server multi-session
According to BleepingComputer, Microsoft addressed this problem in KB5005565, a set of updates published in the middle of September. These are related to devices with Windows 10, the 2004 version, and above.
AVD Bug: Further Details
In a document initiated in July and resolved on the 6th of October 2021, Microsoft was detailing the issue by saying:
We are investigating an issue where devices running Windows 10 Enterprise multi-session, version 1909 might not be able to download updates later than May 2021. This is observed in the Settings app under the Windows Update setting, which will display the message “You’re up to date” even if no updates later than May 2021 have been installed.
What Workarounds Are Available
If KB5005565 cannot be implemented straight off, Microsoft has provided 2 workarounds on this issue. You can follow