We are facing issue in sending fax with custom Cover Sheet.

we have created the cover sheet in https://test2.myportal.opentext.com/XddsPortal  and able to fetch using MMCoverSheetRetrieve API.

MMCoverSheetRetrieve Request: 
 <MMCoverSheetRetrieveRequest xmlns="http://ws.easylink.com/MMCoverSheetRetrieve/2011/01"> but while sending Fax, we are getting Error.
Fax Request:
<JobSubmitRequest xmlns="http://ws.easylink.com/JobSubmit/2011/01"> 

<Message> 

<JobOptions>

<FaxOptions>

<FaxCoversheet>

<UseCoversheet>yes</UseCoversheet>
 <CoversheetName>CSG6116112HEAL</CoversheetName>

 <CoversheetTo></CoversheetTo>

  <CoversheetFrom>(573) 751-2737</CoversheetFrom>

  <CoversheetAttn>Subject: tetstt 

 Comments : tetsyxys</CoversheetAttn>

</FaxCoversheet>  

<FaxMode>standard</FaxMode>

<Subject>tetstt</Subject> 

  <Pilotline>

    <PilotlineStyle>type1</PilotlineStyle>

      <PilotlineText></PilotlineText>

       </Pilotline>    

</FaxOptions> 

</JobOptions> 

<Destinations><Fax><Phone>(444) 564-5645</Phone><From>(573) 751-2737</From><To>Phys, Ip</To></Fax></Destinations> 

<Reports> 

<DeliveryReport> 

<DeliveryReportType>detail</DeliveryReportType> 

</DeliveryReport> 

</Reports> 

<Contents><Part>

<Document>

<DocType>text</DocType>

<DocData format="base64">dGV0c3l4eXM=</DocData>

</Document>

<Treatment>body</Treatment>

</Part><Part><Document><DocType>PDF</DocType><Filename>Study Order Entry-Test, Flex 06-01-1978 ASV 06-17-2020 06.40.39 am.pdf</Filename><DocData format="base64">'just deleted the base64 formated file'</DocData></Document><Treatment>attachment</Treatment></Part></Contents> 

</Message> 

</JobSubmitRequest> 

Response:
 we are getting this Error message: ERROR 

    [0] => XOA-2010 [faxREACH: coversheet not found] : : customer no: 592200: cover type: old styleCSG6116112HEALnot found.

please guide us if we are missing something.