So, the message "Login failed, please check your username and password." shows up whenever I try to join/create any multiplayer room, I've done everything I could, changed accounts, uninstalled and re-installed the game, and also switched between Steam and website versions in an attempt to fix this error, I've also changed my password multiple times. Still, I never managed to fix it by myself, I've seen threads exactly about this error and tried the solutions in the replies, but none worked, I tried typing /login in the chat with my username and password, and nothing happened, I logged in this same account on another PC and this error didn't show up, I don't know what is wrong with my computer, it only happens on it, this is frustrating.