$ fedpkg request-branch f28 Could not execute request_branch: f28 is not a current release branch $ rpm -q fedpkg fedpkg-1.31-5.el7.noarch
This is known, from the discussion on the devel list using the old fedrepo_req CLI should work though.
I believe this is the upstream ticket: https://pagure.io/fedpkg/issue/187 linking to the corresponding pull-request.
Thanks for your report though.
Metadata Update from @pingou: - Issue close_status updated to: Upstream