It appears a CNN account already exists. To connect your third-party account, sign in with your email credentials and connect your account in 'Account Settings'.

If you cannot sign in to Microsoft 365 apps and services, you can use the Microsoft 365 Sign-in Troubleshooter to resolve ...

It appears a CNN account already exists. To connect your third-party account, sign in with your email credentials and connect your account in 'Account Settings'. Can’t remember your password?