Verified that assign and unassign actions work as expected on /api/templates/:id/tags/ /api/groups/:id/tags/ /api/users/:id/tags/
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2017-0012.html