"User not found" Coop Error


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I can't play with my friend for this error. When I try to connect to your world the game show me this message "Union error, user not found". The same happens if he tries to connect with my world.
Both play on Windows 10. We restart the game, reinstall, open firewalls, reset ip adrees, create new worlds...
Any ideas? thanks!

PD: Sorry for spanish language in error image but its the same error "Union error, user not fount"

error astro.jpg

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