---
title: "preAuthorizeDiagnosisKeys(completionHandler:)"
framework: exposurenotification
role: symbol
role_heading: Instance Method
path: "exposurenotification/enmanager/preauthorizediagnosiskeys(completionhandler:)"
---

# preAuthorizeDiagnosisKeys(completionHandler:)

Allows users to authorize a one-time release of diagnosis keys within five days of the authorization.

## Declaration

```swift
func preAuthorizeDiagnosisKeys(completionHandler: @escaping @Sendable ((any Error)?) -> Void)
```

```swift
func preAuthorizeDiagnosisKeys() async throws
```

## Parameters

- `completionHandler`: The completion handler the framework calls when the method completes.

## Discussion

Discussion important: You can call this method from synchronous code using a completion handler, as shown on this page, or you can call it as an asynchronous method that has the following declaration: func preAuthorizeDiagnosisKeys() async throws For information about concurrency and asynchronous code in Swift, see Calling Objective-C APIs Asynchronously. important: Before requesting authorization, ensure the application is in the foreground. This method prompts the user when getting tested to share their diagnosis keys if they receive a positive test result. An app should only call this method if it has a way to determine that the user is about to take a COVID test, such as apps that allow users to schedule testing appointments, and that can also determine if the result is positive. The authorization duration is five days.

## See Also

### Preauthorizing Exposure Keys

- [requestPreAuthorizedDiagnosisKeys(completionHandler:)](exposurenotification/enmanager/requestpreauthorizeddiagnosiskeys(completionhandler:).md)
- [ENDiagnosisKeysAvailableHandler](exposurenotification/endiagnosiskeysavailablehandler.md)
- [diagnosisKeysAvailableHandler](exposurenotification/enmanager/diagnosiskeysavailablehandler.md)