can't fork gitlab-ee

Summary

I cannot fork the GitLab Enterprise Edition repository (this repository) on GitLab.com to make edits on the documentation.

Steps to reproduce

1. visit this documentation page
2. click the edit button, which pops up the fork button
3. click the fork button
4. wait a few minutes

Example Project

This happens with the gitlab-ee repo here, but that's probably due to its size and may not occur in other repositories which fork fine.

What is the current bug behavior?

The import/new page shows the error:

The repository could not be imported.

Unable to fork project 4032626 for repository gitlab-org/gitlab-ee -> anarcat

What is the expected correct behavior?

An edit page should pop up.

Relevant logs and/or screenshots

This was found by trying to edit the documentation to complete https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1230

Output of checks

This bug happens on GitLab.com.

Possible fixes

I frankly have no idea. Presumably this is due to the size of the repo, but it could be some CLA shenanigan.

A workaround could be to clone/push the repo by hand, which is my next step in trying to fix this.