Scenario 1.2.1. Update Username
1.2.1.F1. Username update fails when user is not authenticated.

GIVENuser visit/signinWHENuser type "admin" into input "username"ANDuser type "Admin123!" into input "password"ANDuser click button "sign-in"THENuser redirected to home page

WHENuser click account menu in top-right cornerANDuser click button "my-account"THENsystem show popup "account-menu"

WHENuser click button

WHENuser type "admin" into input "username"ANDuser click button "save"

THENuser see "Authentication credentials is invalid".