Can you try adding your proxy server IP during the startup of Launcher:
In windows we have two shortcuts, one in the desktop and the other one in the apps, it is safe to set in both
- For Desktop Shortcut: right click on the Omniverse launcher desktop shortcut → Click properties → Open shortcut tab → in the target add --proxy-server=1.2.3.4 at the end after a space
- For Apps Shortcut: type Omniverse launcher in the search bar → right click and select open file location → Right click on Omniverse Launcher Shortcut → Click properties → Open shortcut tab → in the target add --proxy-server=1.2.3.4 at the end after a space