Allow a group to push to a protected branch

Hi all,

I try to manually tune branch protection of the master branch for my repository and specify some users and groups to allow them pushing. It works fine for users but I can’t add any groups. It just don’t see all groups I try to specify.

I have add a group with “owner” permission to my repo but it still doesn’t work.

I saw in help that it is possible to specify group in this place but I don’t understand what is wrong.
Does anyone know how to solve the problem?