Adobe Sign - send document SOAP API request returns Invalid Operation error

Hi,

I was trying to do a POST SOAP request call to Send Document SOAP API and run into Invalid Operation when I trigger the service at  https://secure.na2.echosign.com/services/EchoSignDocumentService22

https://secure.na2.echosign.com/services/EchoSignDocumentService22

I even tried replacing file content in base 64 to actual file url from my web site but that too didn't help.

Header information:

Content-Type = text/xml

Access-Token - My Access Token

I did verify that I have agreement_send scope set to self, I also tried flipping it to 'account' but that too didn't help.

Below is my SOAP Request

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

    <soap:Body>

        <ns1:sendDocument xmlns:ns1="http://api.echosign">

            <ns1:apiKey>[[My Access Token]]</ns1:apiKey>

            <ns1:senderInfo xmlns:ns2="http://dto.api.echosign" xmlns:ns3="http://dto21.api.echosign" xmlns:ns4="http://dto9.api.echosign" xmlns:ns5="http://dto20.api.echosign" xmlns:ns6="http://dto14.api.echosign" xmlns:ns7="http://dto18.api.echosign" xmlns:ns8="http://dto19.api.echosign" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

            <ns1:documentCreationInfo xmlns:ns2="http://dto.api.echosign" xmlns:ns3="http://dto21.api.echosign" xmlns:ns4="http://dto9.api.echosign" xmlns:ns5="http://dto20.api.echosign" xmlns:ns6="http://dto14.api.echosign" xmlns:ns7="http://dto18.api.echosign" xmlns:ns8="http://dto19.api.echosign">

                <ns2:callbackInfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:ccs xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:daysUntilSigningDeadline xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:externalId xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:fileInfos>

                    <ns2:FileInfo>

                        <ns2:file>[[File Content in Base 64 format, which I removed in this post as its too large]]</ns2:file>

                        <ns2:fileName>37446165.pdf</ns2:fileName>

                        <ns2:formKey xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                        <ns2:libraryDocumentKey xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                        <ns2:libraryDocumentName xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                        <ns2:mimeType xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                        <ns2:url xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                    </ns2:FileInfo>

                </ns2:fileInfos>

                <ns2:formFieldLayerTemplates xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:formFields xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:locale xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:mergeFieldInfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:mergeFile xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:message>First document to Adobe signature.</ns2:message>

                <ns2:name>Test SOAP</ns2:name>

                <ns2:postSignOptions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:recipients>

                    <ns6:RecipientInfo>

                        <ns6:email xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true">mybusinessemail@gmail.com</ns6:email>

                        <ns6:fax xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                        <ns6:role>SIGNER</ns6:role>

                        <ns6:securityOptions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                    </ns6:RecipientInfo>

                    <ns6:RecipientInfo>

                        <ns6:email>mypersonalemail@gmail.com</ns6:email>

                        <ns6:fax xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                        <ns6:recipientSetMembers xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                        <ns6:role>SIGNER</ns6:role>

                        <ns6:securityOptions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                    </ns6:RecipientInfo>

                </ns2:recipients>

                <ns2:reminderFrequency xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:securityOptions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:signatureFlow>SENDER_SIGNATURE_NOT_REQUIRED</ns2:signatureFlow>

                <ns2:signatureType>ESIGN</ns2:signatureType>

                <ns2:tos xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

                <ns2:vaultingInfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

            </ns1:documentCreationInfo>

        </ns1:sendDocument>

    </soap:Body>

</soap:Envelope>

Response

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><soap:Body><soap:Fault><faultcode>soap:Server</faultcode><faultstring>Invalid Operation</faultstring></soap:Fault></soap:Body></soap:Envelope>

Could someone review above SOAP request and let me know if I'm missing anything.