Microsoft released a new security update to the public for the following systems. The new update brings your build number up to 1904x.1526.
This update is intended for: Windows 10, version 20H2, all editions Windows Server, version 20H2, all editions Windows 10, version 21H1, all editions Windows 10, version 21H2, all editions
Changed or Fixed in KB5010342 Security Update
Addresses an issue that causes a Lightweight Directory Access Protocol (LDAP) Modify operation to fail if the operation contains the SamAccountName and UserAccountControl attributes. The error message is, “Error: 0x20EF. The directory service encountered an unknown failure”.