Reasons for why a Smart campaign is not eligible to serve.
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                The status has not been specified. | 
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                The received value is not known in this version. This is a response-only value.  | 
              
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                The campaign is not eligible to serve because of an issue with the account. | 
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                The campaign is not eligible to serve because of a payment issue. | 
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                The business profile location associated with the campaign has been removed. | 
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                All system-generated ads have been disapproved. Consult the policy_summary field in the AdGroupAd resource for more details. |