Went on youtube a few minutes ago and found this video, Hope I helped some members with this. https://www.youtube.com/watch?v=8--H1EfuseA
1. Start up the game using the low level account
2. Enter MP menu and sign in to high level account (controller 2)
3. Back out controller 2 from party
4. USING CONTROLLER 1, Back out to main menu [The one where the "press x to start" appears]
5. Once in the main menu, press x to start USING CONTROLLER 2 [Black screen will appear]
6. You will get an error message, accept USING CONTROLLER 2
7. Immediately after, quickly double tap x USING CONTROLLER 1 [You will hear a clicking sound]
8. Soon after hearing the 'clicking' notification, spam x USING CONTROLLER 2 until you get a "Connecting to Online Service" message
9. Once you see the message stated above, spam x again, but this time with CONTROLLER 1, keeping pressing x until you see it signed in at the menu with the other account
1. Start up the game using the low level account
2. Enter MP menu and sign in to high level account (controller 2)
3. Back out controller 2 from party
4. USING CONTROLLER 1, Back out to main menu [The one where the "press x to start" appears]
5. Once in the main menu, press x to start USING CONTROLLER 2 [Black screen will appear]
6. You will get an error message, accept USING CONTROLLER 2
7. Immediately after, quickly double tap x USING CONTROLLER 1 [You will hear a clicking sound]
8. Soon after hearing the 'clicking' notification, spam x USING CONTROLLER 2 until you get a "Connecting to Online Service" message
9. Once you see the message stated above, spam x again, but this time with CONTROLLER 1, keeping pressing x until you see it signed in at the menu with the other account