Mrunali Barde
Ansys Employee
Hello there, 

I assume you have installed Students version 2024 R2?
You need not add details in Ansys Licensing Settings for the student's version. 
Can you please confirm if the other versions are working as expected?

Can you please refer to KM #000069522 and let me know?
Link: https://customer.ansys.com/s/article/Workbench-could-not-connect-to-a-valid-licensing-server-Review-your-license-configuration-in-the-Ansys-Licensing-Settings-application-and-make-sure-you-are-connected-to-a-valid-network
 
Wishes,
Mrunali.