Campaign appears in reporting API, not in Management API

Howdy!

I have a campaign that is appear in a client's reports. However, when I attempt to grab the settings for the campaign (or retrieve this campaign from a listing), there is no data. I'm confirming any other details about the campaign with the client, but right now it is invisible everywhere but in reporting. I've redacted a few of the critical bits to protect client data.

Here is a snippet from the report output:

"Campaign Performance Report (Mar 27, 2016-Apr 26, 2016)"
Day,Campaign ID,Campaign,Impressions,Clicks,CTR,Cost,Avg. CPC,Avg. CPM,Converted clicks,Conversions,Conv. rate,Click conversion rate,Cost / converted click,Cost / conv.,Value / converted click,Total conv. value
[...]
2016-04-02,408085702,[redacted],1801,0,0.00%,6670000,0,3703498,0,0.0,0.00%,0.00%,0,0,0.0,0.0
[...]

Below is the SOAP request log showing 408085702 does not exist.

[Apr 27 2016 14:04:15.000000 - INFO] POST /api/adwords/cm/v201601/CampaignService HTTP/1.1
Host: adwords.google.com
Connection: Keep-Alive
User-Agent: PHP-SOAP/5.5.30, gzip
Accept-Encoding: gzip, deflate
Content-Encoding: gzip
Content-Type: text/xml; charset=utf-8
SOAPAction: ""
Content-Length: 768
Authorization: Bearer [redacted]

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="https://adwords.google.com/api/adwords/cm/v201601">
  <SOAP-ENV:Header>
    <ns1:RequestHeader>
      <ns1:clientCustomerId>[redacted]</ns1:clientCustomerId>
      <ns1:developerToken>[redacted]</ns1:developerToken>
      <ns1:userAgent>[redacted] (AwApi-PHP/8.1.0, Common-PHP/8.1.0, PHP/5.5.30)</ns1:userAgent>
      <ns1:validateOnly>false</ns1:validateOnly>
    </ns1:RequestHeader>
  </SOAP-ENV:Header>
  <SOAP-ENV:Body>
    <ns1:get>
      <ns1:serviceSelector>
        <ns1:fields>Id</ns1:fields>
        <ns1:fields>Name</ns1:fields>
        <ns1:fields>Status</ns1:fields>
        <ns1:fields>ServingStatus</ns1:fields>
        <ns1:fields>StartDate</ns1:fields>
        <ns1:fields>EndDate</ns1:fields>
        <ns1:fields>AdServingOptimizationStatus</ns1:fields>
        <ns1:fields>BudgetId</ns1:fields>
        <ns1:fields>BudgetName</ns1:fields>
        <ns1:fields>IsBudgetExplicitlyShared</ns1:fields>
        <ns1:fields>BiddingStrategyId</ns1:fields>
        <ns1:fields>BiddingStrategyName</ns1:fields>
        <ns1:fields>BiddingStrategyType</ns1:fields>
        <ns1:fields>Settings</ns1:fields>
        <ns1:fields>Amount</ns1:fields>
        <ns1:fields>Period</ns1:fields>
        <ns1:fields>DeliveryMethod</ns1:fields>
        <ns1:fields>PricingModel</ns1:fields>
        <ns1:fields>EnhancedCpcEnabled</ns1:fields>
        <ns1:fields>BidCeiling</ns1:fields>
        <ns1:fields>Eligible</ns1:fields>
        <ns1:fields>RejectionReasons</ns1:fields>
        <ns1:fields>FrequencyCapMaxImpressions</ns1:fields>
        <ns1:fields>TimeUnit</ns1:fields>
        <ns1:fields>Level</ns1:fields>
        <ns1:fields>TargetGoogleSearch</ns1:fields>
        <ns1:fields>TargetSearchNetwork</ns1:fields>
        <ns1:fields>TargetContentNetwork</ns1:fields>
        <ns1:fields>TargetPartnerSearchNetwork</ns1:fields>
        <ns1:predicates>
          <ns1:field>Id</ns1:field>
          <ns1:operator>EQUALS</ns1:operator>
          <ns1:values>408085702</ns1:values>
        </ns1:predicates>
        <ns1:dateRange>
          <ns1:min>20160326</ns1:min>
          <ns1:max>20160426</ns1:max>
        </ns1:dateRange>
        <ns1:ordering>
          <ns1:field>Name</ns1:field>
          <ns1:sortOrder>ASCENDING</ns1:sortOrder>
        </ns1:ordering>
      </ns1:serviceSelector>
    </ns1:get>
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

HTTP/1.1 200 OK
Content-Type: text/xml; charset=UTF-8
Content-Encoding: gzip
Date: Wed, 27 Apr 2016 18:04:15 GMT
Expires: Wed, 27 Apr 2016 18:04:15 GMT
Cache-Control: private, max-age=0
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Server: GSE
Transfer-Encoding: chunked

<?xml version="1.0"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Header>
    <ResponseHeader xmlns="https://adwords.google.com/api/adwords/cm/v201601">
      <requestId>0005317b3ce0ace80a0ded85a10e2280</requestId>
      <serviceName>CampaignService</serviceName>
      <methodName>get</methodName>
      <operations>1</operations>
      <responseTime>158</responseTime>
    </ResponseHeader>
  </soap:Header>
  <soap:Body>
    <getResponse xmlns="https://adwords.google.com/api/adwords/cm/v201601">
      <rval>
        <totalNumEntries>0</totalNumEntries>
        <Page.Type>CampaignPage</Page.Type>
      </rval>
    </getResponse>
  </soap:Body>
</soap:Envelope>

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