Populate the list of assignees of an issue in github

Question

I have four contributors in my github project. I create an issue I would like to assign it to a particular contributor but the list shows only two contributors.

How do I add the other persons? Simply typing his name does not work.

Answer 1

An issue can only have assigned collaborators and simple contributors cannot be assigned.

To solve this issue I had to invite the contributors to accept becoming collaborators.

The doc states that :

• Contributor: A contributor is someone from the outside not on the core development team of the project that wants to contribute some changes to a project.
• Collaborator: A collaborator is someone on the core development team of the project and has commit access to the main repository of the project.