youps : solution here : Can the ListenBrainz db be updated to the latest MusicBrainz db?
You need to use a scrobler which submit MBIDs…Is this alway true today ?
Why not guess the MBIDs from artist and song tag ? is this on the roadmap ?
If not is it a problem to use https://github.com/web-scrobbler to fetch mbids (from the api with artist and song) before scrobbling ?