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# isEligible

A Boolean value that indicates whether the app or app extension is eligible to start a credential session.

```
static var isEligible: Bool { get async throws }
```

## Discussion

Always check the value of this property before calling [`startSession()`](/documentation/SecureElementCredential/CredentialSession/startSession()) to dynamically determine if the current device and user configuration can use the Secure Element credential service.

- The most common errors are:
  - [`CredentialSession.ErrorCode.resourceUnavailable`](/documentation/SecureElementCredential/CredentialSession/ErrorCode/resourceUnavailable): The system service is temporarily unavailable.

---

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