Hi Yiting,
Check if you have the feature "lum_fdtd_gui" in your license file.
If yes then, can you make entries in the host file: (You will require admin access)
·       Open the HOSTS file on the client machine and add the license server name and IP of the license server in that hosts file.
·       Path: “C:\Windows\System32\drivers\etc “ as per the following format in your client machine :
Example:
IP address of server      Hostname of server           FQDN   Â
xxx.xxx.xxx.xxx          Â
Â
·       Add the below-mentioned line at the end of hosts file.
·       Once the entry is added save the file.
·       Launch the Ansys application.
If you face any issues, send screenshot of it.