i can't play zombies and can't play with my friends

[Frogoow]

i can't play with my friends on private match can't join them + when i try to open zombies the game exit and don't do anything after pls help ASAP

[Dss0]

Frogoow tell whoever hosts the match to follow this guide https://forum.plutonium.pw/topic/7/custom-games-with-friends