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# reportUnknownPublicKeyCredential(forRelyingParty:credentialID:)

Receives a report from the system that a relying party indicated a passkey credential is invalid.

```
func reportUnknownPublicKeyCredential(forRelyingParty relyingParty: String, credentialID: Data)
```

## Parameters

`relyingParty`

The relying party, typically a website, for which to update the credential.

`credentialID`

An identifier that uniquely identifies the passkey.

## Discussion

The system calls this method when a relying party reports an invalid passkey by calling [`reportUnknownPublicKeyCredential(relyingPartyIdentifier:credentialID:)`](/documentation/AuthenticationServices/ASCredentialUpdater/reportUnknownPublicKeyCredential(relyingPartyIdentifier:credentialID:)).
Your manager can hide or remove the credential after it receives this report.

> Important: Perform any updates in the background and don’t show a blocking UI or any error.

To indicate support for this feature, add the key `SupportsCredentialUpdate` with a value of `YES` under the `ASCredentialProviderExtensionCapabilities` dictionary in your app’s information property list:

```not specified
Info.plist
├─ NSExtension
    ├─ NSExtensionAttributes
        ├─ ASCredentialProviderExtensionCapabilities
            ├─ SupportsCredentialUpdate => YES
```

---

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