Administrator is Manager but cannot call "core_user_create_users"

by GPN Web Developer.  

Hi,

The SOAP response is "Function ("core_user_create_users") is not a valid method for this service" however the user has all capabilities and is in Manager role.

I have tried creating another external service and adding the query parameter "service" with the short name and WSDL still doesn't return "core_user_create_users" as a valid SOAP operation?

Please help. As we cannot use the API at all.

    protected function call($function_name, array $function_params)
    {
        if (! $this->soapEndpoint)
            $this->soapEndpoint = $this->getServerUrl();
            
        $client = new \SoapClient($this->soapEndpoint);
        try {
            $response = $client->__soapCall($function_name, $function_params);
        } catch (Exception $e) {
            throw $e;
        }
        return $response;
    }
    
    public function createUser($username, $email, $firstname, $lastname, $country)
    {
        $user = new \StdClass();
        $user->username = $username;
        $user->email = $email;
        $user->firstname = $firstname;
        $user->lastname = $lastname;
        $user->country = $country;
        $user->auth = 'manual';
        return $this->call('core_user_create_users', [$user]); 
    }

See screen shots for additional details.

Thanks,

Michael