Cant pair on the SteamDeck

Nobody has claimed this yet.

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your issue described in the documentation?

- [x] I have read the documentation

### Is your issue present in the latest beta/pre-release?

This issue is present in the latest pre-release

### Describe the Bug

Every other device can pair with Moonlight, however my Steam Deck refuses to pair. I get the Pair pin pop up and after a few seconds I then get a "Connection closed (error 2)". I do not get the usual pin popup on my host machine like I normally would when a pair request is sent and also when the pin that is briefly showed is used it is refused.

### Expected Behavior

I would normally expect the pin to work, and the connection to not be closed.

### Additional Context

_No response_

### Host Operating System

Windows

### Operating System Version

Windows 11 Home 25H2

### Architecture

amd64/x86_64

### Package

Windows - exe installer

### GPU Type

NVIDIA

### GPU Model

Acer KA240H on NVIDIA GeForce GTX 1080

### GPU Driver/Mesa Version

32.0.15.8266

### Capture Method

None

### Apps

```json

```

### Log output

```shell

```

### Online logs

https://gist.github.com/SimonPhilpott/38995a6e992f12a907c50a4b8936eb97

Start by reviewing the online log linked in the issue and reproducing pairing from a Steam Deck to the Windows 11 host described. Trace the pairing failure indicated by "Connection closed (error 2)" and verify the PIN request reaches the host; done means the host shows the PIN prompt and accepts the Steam Deck pairing.

Written by the indexing model from the issue text.