Forks cannot access upstream runner

I’ve got an upstream Gitlab repo with a “shared specific runner” (weird terminology, but it’s a shared runner that I’ve set up, but appears in the “specific runners” column on my upstream.

I can also see the shared runner on my personal fork, so it’s working as expected.

I cannot see the shared runner on the fork of a team member who recently forked the upstream repo. As far as I can tell all forks should see the shared runners from the upstream – am I missing something?