I am having this problem under Windows 10. I am a new user and is getting this error when I go to settings and try to set sync to Google Drive (Error -120). I am first transferred to Chome to accept the following " View and manage Google Drive files and folders that you have opened or created with this app". When I return to the app I get the error. I have tried this on two networks with the same result.
Network 1: Public wifi (similar to what they have at airports)
Network 2: Mobile hotspot on my phone -> 4g
I have also installed the app on the phone and no problem