Spartan unable to join my Company?

Hey guys, totally weird glitch. Someone is trying to join my Company however when they accept my invite, it just takes them to the homepage and doesn’t let them in. When they go to request to join themselves, there’s no button to do so. I’ve tried inviting multiple times but the same thing happens, just takes them to my page, not accepted in. Anyone know what’s going on? Anyone have a fix? Thanks