The Corbin moments are locked for me even though I've already gotten the Zimmerman. I have a feeling it might be more than just me. If you're having problems with this, please go to the top and press report a bug and report it, that will alert them sooner about the problem. Or we can just make this stream on the forum noticeable for an SDS employee so they can start working on the problem.
Can't do the Corbin Moments.
I have this problem as well. Maybe we have to complete all the missions in stage 1. That wouldn’t make sense though so hopefully it is just a bug