User blog comment:Gundam Legilis/WOR: CCT In Depth/@comment-4010415-20151228010747

It's not that they weren't able to contact him. They just didn't, and they admitted that they didn't even try to contact him. Winter said that, since he hadn't reported in, they thought he must have gotten compromised and so didn't try to contact him, as that would tip off the enemy to who he's working with.