Error pending session failure

hello guys i have joined this forum to find out if anyone has came across an error involving someone joining a singleplayer/coop session and getting the error pending session failure, however my two other mates are fine joining each other.

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I’m having this problem too.
I wanted to play with a friend, we tried several times to join each other’s session with mods and without any mods. We even restarted our computers but the error you mencioned persisted.

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