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# NetworkCompatibilityToken.Compatibility.sessionProtocolVersionMismatch

An indication that two peers running incompatible versions of
RealityKit can’t sync.

```
case sessionProtocolVersionMismatch
```

## Discussion

The [`compatibilityWith(_:)`](/documentation/RealityKit/NetworkCompatibilityToken/compatibilityWith(_:)) method
returns this value when two devices have different OS versions and
there has been a significant change in networking protocol between
those releases.

---

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