Can't join another player's game, and other players can't join my host(official realm)

I Delete the ‘Certificates’ directory, but when I run EasyAntiCheat_EOS_Setup.exe, its software interface just ‘flickered then disappear’ in instant, without any installation screen.
I’m not sure if EOS is installed properly. (Because I found that the ‘Certificates’ directory was not rebuilt).Afterwards, I still couldn’t join other people’s games.

Actually, before I posted, I tried the method in this article,
but it didn’t solve the problem.
Also tried deleting the “EasyAntiCheat” folder and “start_protected_game.exe”,then using steam to verify game integrity.
and the problem still exists.