FIX: Network Printing Problems after installing KB5006670 on Windows 10.
In 12 October 2021, Microsoft released the Cumulative Update
for Windows 10 KB5006670 which contains security fixes and improvements
for Windows 10 builds 20 H2, 2004, 21 H1 & 21 H2.But unfortunately installing the update KB5006670 causes network printing problems as it happened with KB5005565 & KB5005566 updates.*

  Method 1. Install KB5006738 to fix Network Printing issues.
Microsoft released update KB5006738 on October 26, 2021, which is supposed to fix the print issues that occurred after installing KB5006670.So, before you
continue further…

1. Open Command Prompt as Administrator.
2. In command prompt give the corresponding command below according your Windows 10 version:

  Windows 10 versions 2004, 20 H2, 21 H1 and 21 H2:

  reg add HKEY_LOCAL_MACHINE\ SYSTEM\ CurrentControlSet\ Policies\ Microsoft\ FeatureManagement\ Overrides / v 713073804 / t REG_DWORD / d 0 / f
Windows 10 version 1909:

  reg add HKEY_LOCAL_MACHINE\ SYSTEM\ CurrentControlSet\ Policies\ Microsoft\ FeatureManagement\ Overrides / v 1921033356 / t REG_DWORD / d 0 / f
Windows version 1809 and Windows Server 2019:

  reg add HKEY_LOCAL_MACHINE\ SYSTEM\ CurrentControlSet\ Policies\ Microsoft\ FeatureManagement\ Overrides / v 3598754956 / t REG_DWORD / d 0 / f
3. Restart your computer and check
if the printing problem has been resolved.