I need another invite to the GitHub Epic Games group

Hey, I linked my Epic Games and GitHub accounts a couple months ago, but I was unaware that I got an invite to the Epic Games group on GitHub until a couple days ago. I want to access the Unreal Engine 4 source code, but I can’t access it unless I’m in the group. The invite only lasts for a week so I was no longer able to accept it, and I can’t unlink my accounts and relink them to get another one without deleting my repository. How can I get another invite to the GitHub group?
(sorry if this isn’t the right place for this, I emailed Epic Support about it and they auto directed me here)

When I try to unlink, it says this:

What does this mean? Is it referring to my private repository for the game I’m working on or something else?