Service Request API pull

Service Request API pull

Hello,
I am unable to use API to pull service requests.
I am using: https://server/sdpapi/request/19515?&TECHNICIAN_KEY=************************
I am able to view Incident Requests, but when I try to view Service Requests, I get:
<?xml version="1.0" encoding="UTF-8" ?>
<API version="1.0">
<response>
<operation name="GET">
<result>
<status>Failed</status>
<message>Error when performing required operation.</message>
</result>
</operation>
</response>
</API>
Ideas?

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