[BUG] Remote Control failed to connect: Remote Control server rejected the request (HTTP 403)

### Preflight Checklist

- [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code

### What's Wrong?

Plan: Pro/Max, account shows signed in on desktop
Phone cannot discover/see the desktop session at all — not just a retry failure, pairing itself isn't happening
No one else on your team/setup has this issue
Already tried: sign out/in (multiple times), full app restart, full machine reboot, clearing the stored auth token in Settings → Claude Code

### What Should Happen?

should be able to run /remote-control on desktop code and then be able to see my desktop on my phone app

### Error Messages/Logs

```shell
Remote Control failed to connect: Remote Control server rejected the request (HTTP 403)
```

### Steps to Reproduce

1 I logged out of claude desktop, logged back in.
2 on a code chat window, I type /remote-control
3 I see error "Remote Control failed to connect: Remote Control server rejected the request (HTTP 403)"

on phone, I log out , I log in. I go to and I don't see my desktop laptop listed.

_No response_

Start with the /remote-control command and the reported HTTP 403 error, then trace the desktop-to-phone pairing flow and its authentication response. Compare the current behavior with the previously working version; done means the desktop session appears in the phone app without the server rejecting the request.

Written by the indexing model from the issue text.