Invalid ClientID

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

<soap:Body>
    <Client.GetDetail>
              <ApiKey>XXXXXXX</ApiKey>
              <ClientID>YYYYY</ClientID>
    </Client.GetDetail>
</soap:Body>
</soap:Envelope>   

I took the API Key from the Account Settings & I created a client there & used the client ID. I am getting "Invalid ClientID" as the response. Is there anything wrong in the above SOAP Request XML?

Below is the response.

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><Client.GetDetailResponse xmlns="http://api.createsend.com/api/"><Client.GetDetailResult xsi:type="Result"><Code>102</Code><Message>Invalid ClientID</Message></Client.GetDetailResult></Client.GetDetailResponse></soap:Body></soap:Envelope>

Thank you
Uzma

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