I am a Korean player and I use Korean version of Halo MCC. It contains Korean subtitle and Korean voices which are "bless" for most of Korean user.
A few days ago, as I know of, there was an update for Halo Channel.
After this updates, Terminal doesn't work at all. We cannot access Terminal from Halo MCC neither from Channel app. It's not just me. This happens to all Korean users. The Halo Channel app itself does work though.
I switched my XO's locale to US and tested it again. It's working.
So I think, Korean version currently have some error but MS Korea doesn't give a **** about it. They gave up their support on Halo business in Korea.
So to whom do I need to talk to about this? Does anyone have contact point to 343 or MS Studio?