Grim Reaper job won't let me mentor coworkers

When I go to work as a "Collections Agent" with the Life & Death Mod, I always get the mission just before my work day ends to "mentor a coworker reaping"... but no matter what shift I go on, there is never the option to mentor. I've even paused the game and searched every selection group possible and I can not seem to find it. I restarted the game and tried again but still nothing...