PLACEHOLDER_FEED_ITEM_REPORT does not return all extensions

We need to find out the total number of callout extensions defined for a campaign.  However, the CampaigId field in the PLACEHOLDER_FEED_ITEM_REPORT does not support zero impression which means we don't get back those callouts without impressions.

Is there any other way we can find out all the callout extensions irrespective of their impressions?

Oliver

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