“Your ping times are too high to play in the configured dedicated server regions.”
I can’t enter matchmaking. I’ve been playing MCC all week without this problem. I can play other games online just fine.
That sounds pretty serious. I would post something with the error message in the official discussion thread of the new update:
MCC September Patch Discussion
https://www.halowaypoint.com/en-us/forums/84ad72a8b51847978545f685f651fc15/topics/mcc-september-patch-discussion/317c4991-92a7-4760-b401-f5e66e7f4dbe/posts?page=3