HI
- Could you please provide more details about your RDS environment?did you install RDLicense role and RDsession host role on the same vm ?
If you want to allow more than 2 simultaneously sessions, RDS deployment with appropriate RDS CALs installed is necessary.
2.Besides License server and Session Host, what other server roles have you built?
Server roles in Remote Desktop Services environment:
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-roles
Deploying Remote Desktop Services 2016 Step-By-Step
https://nedimmehic.org/2017/01/21/deploying-remote-desktop-services-2016-step-by-step
3.Appropriate RDS CALs should be purchased and installed ,did you install w2016 rds per user cal or per device cal on RD licensing server ?
are both RDSession host server and RD licensing server in the same AD domain ?
Each user and device that connects to a Remote Desktop Session host needs a client access license (CAL).
There are two types of RDS CALs: Per Device CALs and Per User CALs. Please make sure you purchased the right type of CALs.
And your RDS CAL must be installed on a compatible RD license server and RD Session Host versions .
Here is a link explains RDS CAL:
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-client-access-license
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-roles
https://nedimmehic.org/2017/01/21/deploying-remote-desktop-services-2016-step-by-step
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-client-access-license