Activation issues

Hi Team,
I have installed Katalon Studio in Linux.
While activating, I’m getting the error “cannot connect to katalon TestOps server, Please check your internet connection and try again”. I’m using correct mail and password.
I have tried the steps in your documentation, but I’m not using any proxy and my internet connection is fine.
Can you help the people who do not use proxy, to activate?
Also, can admin create an offline activation key for themselves? If so, please let me know.