I created a new Spartan Company last night and I added gamertags of my brother and friends to get the company active and my brother can’t join. I logged into my brother’s account on Halo waypoint and there was no option for request to join. When I accepted any invite to the company it would take me to the company page but there was no way to become part of it. I also resigned him from the Spartan Company he was in prior to accepting an invite. I have more than 3 friends who want to be a part of the company but I can’t even get one of them in.
Ok, it turns out that he was finally able to join. So I think that just answered my questions and problems I’m having.