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This is just a thread to sum up what you need to do for XP to stick.
For Host:
What you do is host a lobby get the amount of Xp you want then back out. There will be a backout with party (If you are in one) and you click do not backout with party. Back out by yourself. As soon as you see the multiplayer menu Sign Out. Then sign in. You will have stuck your XP to your account.
For Other People
If you want to have your XP to stick and you are not the host then you want to get the XP amount and wait till the host leaves. Once he has you leave. Your XP will be stuck.
EDIT: Sometimes if you get kills it will not stick if your host. I do not know why but this happens sometimes.
Most people already knew this but I made this thread for the people that didn't.