Action isn't working on fork prs for organization's private repo

Hi there!
Working in a private repository of an organization.
I’m trying to enable auto-comments on pull request creation.
But the thing is, that action isn’t triggered on pull requests from forked repositories(also private of course).

I wanted to turn on the checkbox in settings, but it’s disabled.
I have admin rights in repo. I asked the owner of the organization to see if he’s able to use this checkbox, but unfortunately, he’s not.
And I’ve tested in my own private repository, there it works fine.

So how to enable actions for forked repos?