Currently in the tree contains the proxy-maintainers ebuild, a bug on this ebuild are assigned to users who are not developers. [1] These users do not have the right to CONFIRM the bug. [1] https://bugs.gentoo.org/show_bug.cgi?id=387443
Please talk to the developer you're working with about getting editbugs privileges. These allow you to fully manage the bugs pertaining to your package(s). The level of interest (=just you) in this does not warrant creating and maintaining another group of privileges handed out.