Mark 4 not working

Games Other Halo
1

completed campaign on solo legendary yet do not have mark 4 in armor menu

2

> completed campaign on solo legendary yet do not have mark 4 in armor menu

There is no Mark IV. The Mark VI is your reward for beating legendary campaign.

3

> completed campaign on solo legendary yet do not have mark 4 in armor menu

Check if you have the commendations for completing the levels, all of them.

If there are any missing, you’ll have to redo that level.

You have to be online to get the commendation, which unlocks the armor.