It appears as though some players are having matchmaking issues with today’s launch of 343 Industries’ Halo The Master Chief Collection.
Microsoft is assuring everyone that they are working on a resolution. Take a look at the official statement below:
Xbox members, are you having a tough time matchmaking in Halo: The Master Chief Collection? As you read this message, we’re working with our external partner to correct this issue right away. We appreciate your patience in the meantime! We’ll update you again when we have more information.
Halo: The Master Chief Collection launches today, November 11 on Xbox One and includes Halo 1-4.
Source: Xbox Support