how can i play private matches in IW5 (MW3)

[CombatHEAVY]

I tried to play private matches with a friend in IW5 (we follow each other in plutonium and we even live in the same state), when i tried to join his match it just said connecting (same thing happened when he tried to join my game), i waited a long time and it just wouldn't let me in, is there anything i can do to play private matches?

[Resxt]

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