Just to clarify this in case someone finds this thread through the search, those lines just mean that the server has verified with the plutonium backend that the connecting client is actually in online mode and has nothing to do with a password.
notMeks said in I can't join my own server with correct password (BO2 MP):
"User with id ... successfully authenticated."
"Letting player with userid ... into the server because the challenge verification completed
successfully."
However, ingame I get a prompt saying "incorrect password".
If my server says the above, it must mean that the set and entered passwords are identical and thus correct right?