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Basically:

Have been playing co-op with a friend for some time.

Yesterday it was all working perfectly.

Today i give him my ID, i am the host, and make him join like usual, his game stops working.

We both checked game integrity, i also moved the party to another area 'cause maybe something was crashing the game in the previous one.

Nothing, still crashes and i can't explain why.

Nothing has changed in both our computers and suddenly it just doesn't work anymore.
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Tamaster: Today i give him my ID, i am the host, and make him join like usual, his game stops working.
If you load an older save, can your friend join? What about if you create a new profile and start a new game?

There is a known issue that can cause a crash in multiplayer when loading or joining if a character is encumbered (the main cause of that was fixed in one of the last updates, but a few people have still run into this). In that case, dropping or transferring the excess weight should allow him to join.