Trouble connecting to Multiplayer

I just completed the campaign with a friend after playing plenty of MM while waiting for him to get on. As soon as we completed the story, I tried to play Warzone and it kicked me off. I force quit Halo 5 and entered the menus. But when I did that, a red screen came up and said something along the lines of “unauthorized user cannot connect to online services. You cannot access online services.” I bought the game digitally, in case that has something to do with it.