All scrobbles being ignored

Previous usage of Rocksky with multi-scrobbler's Listenbrainz implementation worked fine for the one test scrobble I made. This was last week or so. Now though, all the scrobbles I am submitting are being ignored with a successful response.

Example scrobble payload:

{
    "listen_type": "single",
    "payload": [
        {
            "listened_at": 1762789719,
            "track_metadata": {
                "artist_name": "Louie Zong",
                "track_name": "Lavender Town",
                "release_name": "Surfin' GBA",
                "additional_info": {
                    "duration": 102,
                    "submission_client": "multi-scrobbler",
                    "submission_client_version": "rocksky-3e083b1",
                    "artist_names": [
                        "Louie Zong"
                    ],
                    "release_artist_name": "Louie Zong",
                    "release_artist_names": [
                        "Louie Zong"
                    ],
                    "music_service": "spotify.com",
                    "music_service_name": "Spotify",
                    "spotify_id": "7JX4bnEqhkOaYBkuwlPy9F",
                    "spotify_album_id": "1VQrE0P1E9zjhauTCug6IP",
                    "spotify_artist_ids": [
                        "7jOY91ZU7kn86slH3fBbaD"
                    ]
                }
            }
        }
    ]
}

With the response from Rocksky:

{"payload":{"ignored_listens":1,"submitted_listens":0},"status":"ok"}