There is an issue where existing Transparent Login (TL) connections to and terminal/RDS server by a given user are closed when someone else connects.
The message obtained when the second user tries to connect with TL is the following
Once the original user closes their session and recreates it, the second session continues successfully
PRIVILEGED ACCESS MANAGEMENT, All versions
This is most likely caused by a Local Policy being defined at the remote windows server where TL is being used, to restrict connections to Remote Desktop Services (RDS) to just one user.
To see if this is the case, in the Windows machine where you want to have multiple simultaneous TL users connected, do the following
Once there check the following
This policy should be in Disabled to allow multiple connections to be taken.
If the restriction by policy is enabled or not configured, make sure to turn it off (Disable)