Hey! Im having a similar problem with my brother, when he accepts my invite his game crashes, but mine continues running perfectly fine, at first i tought it could have someting to do with the wi fi since we use the same IP adress, by any chance you tried playing on the same IP adress?

joes1331
@joes1331
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Bo2 Zombies Crashing if a party invite is accepted -
Cant play with my brotherHello, so i got my brother to get bo2, got him a dlc aswell so we can do some zombies easter eggs together, but whenever we lobby together in a party, plutonium/bo2 just closes itself, and does not allow him to join me, my plutonium/bo2 continue running perfectly fine, but his shutdown, we both use the same wi-fi, i wonder if that has anything to do with it