The first reason of the error ID 4105, on RDS Server 2016/2012/2008, is that the Remote Desktop Licensing Server, is not have been added at 'Terminal Server License Servers' group in Active Directory. Add RDS Licensing Server to Terminal Server License Servers Group
How to Fix: Remote Desktop license (RDL) server cannot update the license attributes on Active Directory 2008/2012/2016. If the license server is installed on a domain controller, after you have added the appropriate accounts to the Terminal Server License Servers group, you must restart the Remote Desktop Licensing service to track or report the usage of RDS Per User CALs. If the license server is installed on a domain controller, the Network Service account also needs to be a member of the Terminal Server License Servers group. Ensure that the computer account for the license server is a member of Terminal Server License Servers group in Active Directory domain 'domain'. This tutorial contains instructions to fix the Event ID 4105 on an RDHs Server 2016/2012/2008: 'The Remote Desktop license server cannot update the license attributes for user in the Active Directory Domain'.
