Text Tutorial:
How to swap player 1 with player 2

Requirements:
3 controllers

Tutorial:

Go to the multiplayer menu.
Sign in with any xbox account on controller one.
Click A on the store with the second account, and then click A to remove the error message. This prevents looping later on.
Sign in with player 1 on controller two.
Press A with controller one on local.
Press A with controller two to bring player 1 in to the lobby.
Press A on the third controller to sign in a player, and while the white box is still loading, you are going to press A on the second controller.
Now you should be able to navigate your accounts with the second controller, and click any account to replace the account that is currently signed on with the second controller.

This isn't exactly the switch from before, since it only signs in one account, but it replaces the account in the same way as before, so I'm hoping this could help for any new prestige glitch.

Credits go to Im4eversmart from S7!!!!!!!!!!!!!!!!