Log In to GitHub Trouble

I am hoping someone can point me in the right direction. On my Mac at home I can connect with phpStorm to GitHub with no problems. At work on a Windows 7 machine I can't log in to GitHub at all. I have:
PhpStorm 2018.2.2
Build #PS-182.4129.45, built on Aug 22, 2018
I try File > Settings > Version Control > GitHub
Add account
I try it with my full Email address and just my login name (pictured above).
My office has a firewall but on the command line I used "git clone <URL>" and cloned down one of my repos so I know the firewall isn't the problem. Can anyone suggest how to resolve this? Please help.
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I found a solution to the problem. My Windows computer had a .gitconfig file with proper proxy settings but phpStorm wasn't set for proxy. After looking around online I found where to set phpStorm's proxy settings:
Settings > Appearance & Behavior > System Settings > HTTP Proxy
Once there, I used the manual settings and put in the URL for my proxy, port, login and password.
I cloned down my project with no difficulties.