I bought the game to play with a friend but, this message appears everytime.
I’ve already tried with verifying the integrity of the files and updated the certificates.
I couldn’t really find anything about this error.
This support page may or may not be helpful:
If you still have the issue after the troubleshooting steps, view the note at bottom of that page about submitting a request to the Support team.
PS: One person a long time ago said they disabled firewall as the game launches and then enabled firewall when the Main Menu appears , and that was a workaround for them