This repository is not transferrable. Please contact the owner of the root repository: Why?

[ndrosson]

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Hi,
I'm using GitHub Classroom in my organisation, so I have private template repos, assignments and my students have forks of the template repo. Now I want my students that have finished their study to take their repos to their private account. Unfortunatly, in their repo they can't and I don't find why.

They are Admin of their repo (and I am also).
Their repo is a fork of the private template repo of my organisation (I'm owner of the Organisation and admin of the template repo).
I've checked the configuration of my Organisation: the option "Allow members to delete or transfer repositories for this organization" is checked.

As I am the owner of the organisation they contact me, but I don't know what I can do more than everything above.

Do someone has a tip for me, what I can look at?

Thanks in advance
Nic