You’ve attempted to login with a NATEL® login. However, this login is not linked with a valid Swisscom login.
You’ll first have to link your NATEL® login with a Swisscom login. Please link your NATEL® login with a Swisscom login in the customer centre in the section "Passwords and logins" , then you can also connect myCloud with the new Swisscom login.
Afterwards you’ll be able to link your myCloud with the new Swisscom login.