---
title: AccessoryTransportSession.Error.unsupported
framework: accessorytransportextension
role: symbol
role_heading: Case
path: accessorytransportextension/accessorytransportsession/error/unsupported
---

# AccessoryTransportSession.Error.unsupported

An error that indicates the framework doesn’t support an client-provided value or operation.

## Declaration

```swift
case unsupported
```

## See Also

### Identifying session errors

- [AccessoryTransportSession.Error.invalidated](accessorytransportextension/accessorytransportsession/error/invalidated.md)
- [AccessoryTransportSession.Error.unknown](accessorytransportextension/accessorytransportsession/error/unknown.md)