Apple imessage can't log in. When I log in with an appleid, I always get the wrong password, but the password is correct? what's up

I used to be like this. Later, I learned that if your device has enabled two-step authentication, please log in to APPid.APPle.com and manage the password to generate the password for the application. Because neither IMessage nor FaceTime supports two-step authentication, the password is correct, but for these two apps, you can't send an authentication message to the device, so an error will be displayed. When generating a password, you must enter the full name of the application, such as IMessage, not just IM. So the problem is solved so happily! ! ! ! !