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# authorizationController(controller:didCompleteWithError:)

Tells the delegate when authorization fails, and provides an error explaining why.

```
optional func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: any Error)
```

## Parameters

`controller`

The controller that performs the authorization attempt.

`error`

An error that explains the failure using one of the codes in [`ASAuthorizationError.Code`](/documentation/AuthenticationServices/ASAuthorizationError-swift.struct/Code).

---

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