Also, here are a couple of tips to help anyone having the same problems I have in MCC Multiplayer:
Also, if you ever go to play and can't get past the main menu, turn off your XBOX and hold the power button as you turn it off for about 20 seconds. Then when you turn it back on, it will take a little longer to come back on and prompt you to make any needed update in MCC. Everytime I get stuck, this works.
Also, if you back out of a party and can't get back in, press the center XBOX button on the controller, then the start button and choose "quit game." Then go back into the game and you will be able to join the other party again.
C HUNTER 0NE