Windows Server unable to install Cumulative update 21H2 for x64-based Systems (KB5066782)

Hi All,

Unable to install the above update. I tried things like sfc/scan, dism tool features but non works. all other updates install except the above. Tried running the update manually but failed. Think this is also breaking functionality of the virus /malware guard. ACS (azure Code signing). The last option that I am thinking of is to run a sever repair with the installation media. I also tried windows trouble-shooter for updates.

Any ideas ?

This is installed as a virtual machine on Hyper-V. Don't want to rebuild the server. Looking for a solution. 

The Error code is  

• 0x80073701