Halo 5 Armour unlockable

So a friend and I arnt the best players but we finally managed to completely every Halo Campaign on Legendary after months of working on it, How ever I did not get the Halo 5 Armour your meant to get when completing all the games on legendary but he did can someone tell me how do I get the Armour now? Every single mission is completed on co-op I didnt miss any of them I even have video footage to prove it all the games were streamed.

Make sure you have followed the advice in the “I didn’t unlock my Helioskrill” thread.

Congrats on your achievement though, it takes a lot of dedication!