When configuring the license server within the WEM Administration Console, the following error appears:

"Specified license server is not available or appropriate licenses are not installed. Retry or Cancel"

POSSIBLE SCENARIO #1: 
The Windows Firewall WEM broker Server may be blocking communication to the license server and therefore, no connection can be made from the Wem Broker to the Citrix License Serer.  Disable the Windows firewall on the WEM Broker server.
****if the Windows firewall must remain "UP", this Citrix Article for the communication ports that are needed for proper communication to be allowed****

POSSIBLE SCENARIO #2:
Customer is running with XA/XD Advanced licensing
--WEM specifically requires XA/XD Enterprise or Platinum with active SA
Licenses will need to be upgraded to Enterprise or Platinum XA/XD licenses.

POSSIBLE SCENARIO #3:
Identify the proper License Server Manager Port being utilized on the Citrix License Server (default is 27000, but a custom port may be used).
Check the Infrastructure Services Configuration Utility's "Licensing" tab and then the "Configure License Server" option under the "About" tab in the WEM Administration Console.
Update the port information in either application where the license server port is incorrect.
 

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Problem Cause

Cause for POSSIBLE SCENARIO #1: 
Windows firewall on the WEM broker was blocking connections to the license server

Cause for POSSIBLE SCENARIO #2: ​
Customer is running with XA/XD Advanced licensing
--WEM specifically requires XA/XD Enterprise or Platinum with active SA

Cause for POSSIBLE SCENARIO #3:
A different licensing server port is specified between the WEM Administration Console and the Infrastructure Service Configuration Utility.

Communication Port used by Citrix Technologies: https://support.citrix.com/article/CTX101810
Citrix License Server port information: https://docs.citrix.com/en-us/licensing/11-14/manage/change-port-numbers.html