I did everything Xerxes' guide said to do, and my friend gets a "Joining game session..." but it wont let them join. Can i get some help?

Medicc
@Medicc
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how do i join custom games with friends? -
How do you play zombies w/ friendsXerxes i did everything the guide said to do but my friend gets a "Joining game session..." yet they never join. Can you help with this? Thanks!