The operation couldn’t be completed. (com.google.GTMOAuth2 error - 1001.)

When I go to the remote tab and refresh the list of repositories I always get the error message “Refreshing Remote Repositories Failed” for my GitHub account. The Error Contents has the following text:

“The operation couldn’t be completed. (com.google.GTMOAuth2 error - 1001.).

Signing in again doesn’t help. Refreshing still fails. When I cancel the Sign In everything seems to work however, so I’m not sure what’s going on.

I have two external accounts set up. One for Bitbucket and one for GitHub, I have the same username on both services, so maybe it’s somehow related to that?

I've also got 2 factor auth enabled for both accounts, not sure if that makes a difference?