Passwordless Login Page

When I try to login through Email authentication give error :-

Error : Passwordless login is supported only for members logging in to an Experience Cloud site.

Code:=

public with sharing class 

#Trailhead Challenges #Salesforce Developer #Service Cloud #Experience Cloud #MFA - Getting Started                    

public with sharing class CRMLoginController {
    @AuraEnabled
    public static String callCommunityLogin(String email) {
        try{
            String response;
            List<User> listUser = [SELECT Id from User WHERE Username=: email];
            if(listUser != null && !listUser.isEmpty()){
                String verificationId = System.UserManagement.initPasswordlessLogin(listUser[0].Id, Auth.VerificationMethod.EMAIL);
                response = verificationId;
                System.debug('response'+response);
            }
            else{
                response = 'Account does not exist.';
            }  
            return response;
        }
        catch(Exception e){
            if(e.getMessage() == 'This user doesn\'t have access to this verification method.'){
                 System.debug(e.getMessage());
                return e.getMessage();
            }
            else{
                return 'Unexpected error occured.';
            }
        }
    }
}