i tried with the follwing Saop request
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Header>
<wsse:Security soapenv:mustUnderstand="1" xmlns:wsse="http://docs.oasis-
open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
<wsse:UsernameToken>
<wsse:Username>test123@gmail.com</wsse:Username>
<wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-
200401-wss-username-token-profile-1.0#PasswordText">******
</wsse:Password>
</wsse:UsernameToken>
</wsse:Security>
</soapenv:Header>
<soapenv:Body>
<RetrieveRequestMsg xmlns="http://exacttarget.com/wsdl/partnerAPI">
<RetrieveRequest>
<ObjectType>DataExtensionObject[Test DE]</ObjectType>
<QueryAllAccounts>true</QueryAllAccounts>
<Properties>Email</Properties>
</RetrieveRequest>
</RetrieveRequestMsg>
</soapenv:Body>
</soapenv:Envelope>
I always get the following response
<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"
xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing"
xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-
wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-
open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
<soap:Header>
<wsa:Action>RetrieveResponse</wsa:Action>
<wsa:MessageID>urn:uuid:a5cc51af-790e-4876-8e35-
b47c09a06dce</wsa:MessageID>
<wsa:RelatesTo>urn:uuid:123ad64f-08cf-46c6-bc9e-
21677d3ef3cc</wsa:RelatesTo>
<wsse:Security>
<wsu:Timestamp wsu:Id="Timestamp-81bacc7d-fc78-4a1d-8b72-
5d1d8120240e">
<wsu:Created>2018-03-30T07:58:23Z</wsu:Created>
<wsu:Expires>2018-03-30T08:03:23Z</wsu:Expires>
</wsu:Timestamp>
</wsse:Security>
</soap:Header>
<soap:Body>
<RetrieveResponseMsg xmlns="http://exacttarget.com/wsdl/partnerAPI">
<OverallStatus>Error: Invalid object name 'C100010308.Test DE'.
</OverallStatus>
<RequestID>80902d85-ee8d-4b82-9c97-ddfdfb04881d</RequestID>
</RetrieveResponseMsg>
</soap:Body>
</soap:Envelope>