The point is the Swisscom login password and the email password are different. The password of your Bluewin email address has been set up at his creation. You usually never use it then, except, for example to install your email account on a smartphone.
The password you used to create a new email account is the password of your Swisscom login and not the one for your email address.
You can find some help here too
Have a good day,