Reddit proof fails with "No server-given hint" (code=306)

Hello,

I am seeing an issue with a new Reddit proof.

## Account details

- Keybase username: `seph29`
- Reddit username: `seph29_-`

## Proof

https://www.reddit.com/r/KeybaseProofs/comments/1wdlfkg/my_keybase_proof_redditseph29_keybaseseph29/

## Command

```bash
keybase id seph29
```

## Result

```text
OK "seph29_-" on reddit failed: No server-given hint for sig=ff1244df4d971fc238b17bfd195769c8e46491a770e075238181d1406117ce1a0f (code=306)
```

The Reddit post is public and the proof content appears correct.

Start by reproducing the failure with `keybase id seph29` and inspect the linked Reddit proof at the provided URL. Trace how the client verifies Reddit proofs and handles error code 306. Done means the public proof is accepted without the “No server-given hint” failure, with relevant verification coverage updated if the repository provides it.

Written by the indexing model from the issue text.