By default, Intercom Calls are NOT checked in the SYSTEM FORWARDING path list...go to the user, find his sys fwd path and double-click the icon by the path that goes to his HG. You'll get a list of parameters you can turn on for that path. If you really want his IC calls to follow the path (not usual, but possible) just turn on IC. Obviously you no longer get the DND info then, which you might miss.
BTW, hunt group calls NEVER follow sys fwd paths, only direct or transferred calls for that station.
Let us know if you need more.