I completed halo 3 Laso playlist with three of my buds and only two outta four unlocked the achievement . It says my buddy and I need to complete the epilouge yet we clearly can’t do that since it starts us from seiraa 117 . But all progress is there.
You might post here about this:
May not see any additional help. Something to contact MS game support about if nothing happens.
Yoo that link isn’t letting me click it it’s just part of the message