Many people ask how to validate a CE mark or how to validate a CE mark certificate. CE marking is a self-declaration, meaning that you don't need to register your CE marking with a central organisation. Of course, some exceptions exist, e.g. certain medical devices need to be registered with the local country's medical authority.
This means that a CE mark can only be validated by going through the documentation, i.e. Technical File and Declaration of Conformity.
Feel free to read a bit more about validating a notified body certificate.