Pending Connection Failure Single Co-Op

I can’t join my friends co-op singleplayer game, They can’t join me neither.
I’m trying to play co-op with friend and I’ve tried to join through steam with “join game” and through the invite he sends but every time it’s the same, after 10+ seconds of trying to join I get this message:

Pending Connection Failure. Could not connect to server. Your connection to the host has been lost.

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