<p><a href="https://github.com/chvsp" class="user-mention">@chvsp</a>: it seems to be a shortcoming of Github; see <a href="https://help.github.com/articles/assigning-issues-and-pull-requests-to-other-github-users/">https://help.github.com/articles/assigning-issues-and-pull-requests-to-other-github-users/</a> : </p>

<pre><code>You can only create assignments for yourself, collaborators on personal projects, or members of your organization with read permissions on the repository.
</code></pre>

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