If you are getting below error you need check below parameters.
License server cannot issue licenses to the remote desktop session host server because the "License server security group" group policy setting is enabled.
1. Whether RD Session host and License server is in same domain.
2. Incase of RD Session host and License server is in cross domain then you need to correct below things.
2. Incase of RD Session host and License server is in cross domain then you need to correct below things.
Make sure we have two-way trust enabled in both domain.
License server must be a member of the Terminal Server License Servers group in those domains.
Make sure TS License server is member of Terminal Server License Servers Properties in both the domain.
