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# CampaignSystemStatusReason

A reason code explaining why a campaign is not currently running.

```
string CampaignSystemStatusReason
```

## Discussion

One or more `CampaignSystemStatusReason` values appear in the `systemStatusReasons` array on a [`Campaign`](/documentation/Apple-Ads-Platform-API/Campaign) when `systemStatus` is `NOT_RUNNING`. These codes are read-only and system-applied. Use them to diagnose delivery issues and determine the appropriate corrective action.

---

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