I beat Halo 1-4 on legendary and have the legend achievement but I still don’t have the Helioskrill armor for Halo 5. I know that this is a common issue and was wondering if there is anything I can do to fix it.
Change a customization item such as armor or an emblem in MCC and then load up H5. It should force a sync and get you Helioskrill. You can change your MCC settings back right after.