---
title: MSCriticalMessagingError.unknown
framework: messages
role: symbol
role_heading: Case
path: messages/mscriticalmessagingerror/unknown
---

# MSCriticalMessagingError.unknown

The error code the framework returns after an unknown error occurs.

## Declaration

```swift
case unknown
```

## Discussion

Discussion The framework returned an unknown error.

## See Also

### Error codes

- [MSCriticalMessagingError.invalidAuthenticationRequest](messages/mscriticalmessagingerror/invalidauthenticationrequest.md)
- [MSCriticalMessagingError.notSupported](messages/mscriticalmessagingerror/notsupported.md)
- [MSCriticalMessagingError.notAuthorized](messages/mscriticalmessagingerror/notauthorized.md)
- [MSCriticalMessagingError.sendFailed](messages/mscriticalmessagingerror/sendfailed.md)