Cant join a squad or fnd a match
This is a known issue with some of Microsoft’s services that cropped up earlier. Both 343 and Xbox are aware and investigating, it should be fixed fairly soon.
Please use this thread in the meantime
https://www.halowaypoint.com/en-us/forums/f0258e8001734968984e8b56990f8daf/topics/halo-wars-2-servers-down/844146c0-4823-4f50-83c8-e4261b6f4367/posts