Why is it not letting me sign into my PS4 account?
The most common reason for the sign-in error is that you input your username or password wrong. So, make sure your input the right username and password. 2. ... PS users will encounter “PlayStation Network Sign-In: Failed” when the server is in maintenance.
Why is PSN saying my password is incorrect?
If you are attempting to sign in to PlayStation Network and get a message saying that it is the wrong password, don't worry. Sony has announced that it has reset the passwords on some PSN accounts because it detected "suspicious activity". ... To get your account back, all you have to do is reset your password.
Why is PlayStation Network not working?
Check Your Network Connection.
A slow or unstable network connection could also be why the Playstation Network is not loading on your console. To confirm this, run a speed test on your Playstation by going to the Settings > Network > Test Internet Connection.