My multiplayer is locked

Hey fellow halo gamers.
I just picked up halo 5 a week ago superb game in in my opinion. I just have one complaint I’ve heard so many awesome things about the multiplayer mode but I can’t access it from the main menu screen. I though it might be locked until you complete a handful of missions in the campaign, but this is not the case. I’ve completed about 7 missions so far and I still can’t access multiplayer is there some secret to it or what’s going on here? Please help! Thanks to all.

Does any error message show up when you try to connect to multiplayer?

I have the error message I’m receiving ‘‘Error authorizing user with Halo 5: Guardians services. You will be unable to access online modes.’’

That means you are offline. Ensure your box has internet connection. Then try a hard reset on the box. Log into your profile before you launch the game.

Already done. It didn’t work.

Try force closing the game until it works, normally after a few times the servers recognise a connection going to them