Trying to fork project to GitHub and get disconnected.

I am trying to fork a project in Keil Studio to my GitHub account. When I login to Keil Studio I get a message that I am authenticated for access to my GitHub account. I am following the Arm Keil Studio Cloud user manual to use the Source Control to push this project to my GitHub account. But each time I try, using "push", or "Fork to GitHub" I get disconnected, first from Keil Studio:

and then from my GitHub account. I can reconnect, but it keeps happening. 

As context, the original project was cloned from a repository on github. I have made and committed changes within Keil Studio, and I want to fork it to my GitHub account so that I can share it with a collaborator.

If there is an easier way to share a project, that would also be useful to know.