Hi dkommel
I got rid of this message, and block it with this registry key
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate]
"TargetReleaseVersion"=dword:00000001
"ProductVersion"="Windows 10"
"TargetReleaseVersionInfo"="21H2"
After creating the key with these Values, you merge it and reboot.
Keep this code in your files because when the next major upgrade of Windows 10 will be available, you will have to go in the Registry to change the data of “TargetReleaseVersionInfo” to the one deployed.
Bye