Trouble with GitHub integration

I am trying to add GitHub integration to my app, but so far I haven’t been able to get it to work. When I get to the stage where I am prompted to sign in to my GitHub account, I sign in and then immediately get a 404 page on GitHub even though I am signed in correctly.
I tried setting up an action anyway, but it always returns a “Unknown Error” message when I try to use it. I double checked to make sure I had the right Github Username and Repository Name and it all looks good, but still doesn’t work.
Has anyone successfully gotten this integration to work?

Can you reliably reproduce it in a video? I would suggest submitting a ticket.