Game Groups Not Syncing

This morning I wanted to create a multi-group giveaway before the new year. While creating the giveaway I realized I wasn't following the official game group like I thought I was. I joined the group, synced my account, but it didn't show up. I thought maybe there was a delay in syncing groups, so I waited. It's been over 12 hours now, I synced my account again just now but it still doesn't recognize me as a member of the group. I did a search, but I only found [one post[(http://www.steamgifts.com/discussion/rMfSy/group-syncing-issue-possible-fix) from 6 months ago which makes it sound like it's a common problem. The workaround in the post suggests setting the group to your primary group before syncing, but you can't set an official game group as your primary group.

There is less than an hour left of 2015 for me, is there anything I can do to get the group to sync?