1.After doing the glitch you or your friend is in the loop at the title screen this person must dashboard while the other person is in the game with the bots (Make note of the EXXACT settings the game has)
2. Whoever went to the dashboard must then load up call of duty again and go to multiplier and into custom games.
3. Change the custom game settings to the EXACT settings as the game your friend is in with the bots, this will ONLY work if the settings, map, game type, bot settings are the exact same as the game your friend set up
4. Hover over start game, and push Y scroll down to your friends game and hit X to join session (or have your friend invite you) the loop screen should not happen and you will be in the game with your friend, however you are not guarnteed to be on the same team that is random (I think)


Hope this helps message me with any questions!