Hello,
Thank you for posting in Q&A forum.
Here are some steps that we can take to troubleshoot and resolve the issue:
1.Verify that if the RD Licensing Server is correctly configured and licenses are properly installed.
2.Restart the RD Licensing Service on both the server and the client.
3.Check if there's any network connectivity issue between the client and server.
4.Try uninstalling and reinstalling the CALs on the licensing server and check if issue still persists.
To help other customers who may be facing the same issue, please don't forget to vote if the reply is helpful.
Best Regards
Zunhui