Adding mobileIds to CrmBasedUserList isn't incrementing list size

[Brian Czako]

We've provided a mechanism for a large client of ours to create user lists 
and upload IDFA/AAID data to them.
The lists are getting successfully created, and are created with 
uploadKeyType = MOBILE_ADVERTISING_ID.
We've been uploading data to their lists over several days and continue to 
see an upload status of IN_PROCESS and the list has a size of 0.

Here is a sample, redacted request I'm making on a list I created, and have 
verified that my lists also have a size of 0.
Sample request:

<?xml version="1.0" encoding="utf-16"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/";>
  <s:Header>
    <Action s:mustUnderstand="1" 
xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none";></Action>
    <RequestHeader xmlns:i="http://www.w3.org/2001/XMLSchema-instance"; 
xmlns="https://adwords.google.com/api/adwords/rm/v201802";>
      <clientCustomerId 
xmlns="http://schemas.datacontract.org/2004/07/Google.Common";>REDACTED</clientCustomerId>
      <developerToken 
xmlns="http://schemas.datacontract.org/2004/07/Google.Common";>REDACTED</developerToken>
    </RequestHeader>
  </s:Header>
  <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xmlns:xsd="http://www.w3.org/2001/XMLSchema";>
    <mutateMembers 
xmlns="https://adwords.google.com/api/adwords/rm/v201802";>
      <operations>
        <operator 
xmlns="https://adwords.google.com/api/adwords/cm/v201802";>ADD</operator>
        <operand>
          <userListId>REDACTED</userListId>
          <membersList>
            <mobileId>BDB49F4E-FFFF-FFFF-FFFF-1687D040AF86</mobileId>
          </membersList>
          <membersList>
            <mobileId>77E2E36E-FFFF-FFFF-FFFF-619BA07C03C3</mobileId>
          </membersList>
        </operand>
      </operations>
    </mutateMembers>
  </s:Body>
</s:Envelope>


Sample response:

<?xml version="1.0" encoding="utf-16"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";>
  <soap:Header>
    <ns2:ResponseHeader 
xmlns:ns2="https://adwords.google.com/api/adwords/rm/v201802"; 
xmlns="https://adwords.google.com/api/adwords/cm/v201802";>
      <requestId>REDACTED</requestId>
      <serviceName>AdwordsUserListService</serviceName>
      <methodName>mutateMembers</methodName>
      <operations>1</operations>
      <responseTime>224</responseTime>
    </ns2:ResponseHeader>
  </soap:Header>
  <soap:Body>
    <ns2:mutateMembersResponse 
xmlns="https://adwords.google.com/api/adwords/cm/v201802"; 
xmlns:ns2="https://adwords.google.com/api/adwords/rm/v201802";>
      <ns2:rval>
        <ns2:userLists 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:type="ns2:CrmBasedUserList">
          <ns2:id>REDACTED</ns2:id>
          <ns2:isReadOnly>false</ns2:isReadOnly>
          <ns2:name>REDACTED</ns2:name>
          <ns2:description></ns2:description>
          <ns2:status>OPEN</ns2:status>
          <ns2:integrationCode></ns2:integrationCode>
          <ns2:accessReason>OWNED</ns2:accessReason>
          <ns2:accountUserListStatus>ACTIVE</ns2:accountUserListStatus>
          <ns2:membershipLifeSpan>10000</ns2:membershipLifeSpan>
          <ns2:listType>CRM_BASED</ns2:listType>
          <ns2:isEligibleForSearch>false</ns2:isEligibleForSearch>
          <ns2:isEligibleForDisplay>true</ns2:isEligibleForDisplay>
          <ns2:UserList.Type>CrmBasedUserList</ns2:UserList.Type>
          <ns2:appId>123456789</ns2:appId>
          <ns2:uploadKeyType>MOBILE_ADVERTISING_ID</ns2:uploadKeyType>
          <ns2:dataSourceType>FIRST_PARTY</ns2:dataSourceType>
          <ns2:dataUploadResult>
            <ns2:uploadStatus>IN_PROCESS</ns2:uploadStatus>
          </ns2:dataUploadResult>
        </ns2:userLists>
      </ns2:rval>
    </ns2:mutateMembersResponse>
  </soap:Body>
</soap:Envelope>

Is there something we need to do to have our client's data start 
incrementing in their AdWords account?
Does the casing of the device IDs matter?
Any help would be appreciated.

Thanks,
Brian

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