How to perform cross-organisation fork using GitHub App Integration

[dadepo]

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Here is the scenario.

I have a GitHub app installed in org A and org B, and for each company I can successfully exchange the installation id for access token I can use to interact with their resources on GitHub.

Now I want to fork a private repository in org A into org B using the GitHub installation. ie do a cross-org forking.

From the create fork documentation here https://docs.github.com/en/rest/repos/forks?apiVersion=2022-11-28&versionId=free-pro-team%40latest&category=repos&subcategory=webhooks#create-a-fork it says

Although this endpoint works with GitHub Apps, the GitHub App must be installed on the destination account with access to all repositories and on the source account with access to the source repository.

I have the App installed in both the destination account and source but whenever I try to fork with it I get the error

{
"message": "Not Found",
"documentation_url": "https://docs.github.com/rest/repos/forks#create-a-fork",
"status": "404"
}

So it seems the documentation is wrong, and it is not possible to perform a cross-org forking using the GitHub App integration or I am doing it wrong?

[dadepo]

This worked when the source repo is public. But when it is private it does not work. Despite the fact that I have enabled forking of private repositories in the source organisation:

And also from what i can tell, the app is installed with all the required permissions

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