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# AdSystemStatusReason

A reason code explaining why an ad is not currently running.

```
string AdSystemStatusReason
```

## Discussion

One or more `AdSystemStatusReason` values appear in the `systemStatusReasons` array on an [`Ad`](/documentation/Apple-Ads-Platform-API/Ad) when `systemStatus` is `NOT_RUNNING`. These codes are read-only and system-applied. They provide the specific cause behind a non-running state and indicate what action, if any, is required to resume delivery.

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