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# CampaignServingStateReasons

Reasons the system provides when a campaign can’t run.

```
string CampaignServingStateReasons
```

## Discussion

Ad creatives in campaigns with an `APPSTORE_TODAY_TAB` [`SupplySource`](/documentation/apple_ads/SupplySource) receive a review from Apple for compliance.  Ads that are pending review are on hold until Apple completes the review. The system doesn’t serve rejected ads.

---

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