@jonas Oh, btw! I forgot. There’s an Android scrobbler called Pano Scrobbler that manages to send feedback without any MBIDs on the metadata (it works using my own tracks). I wonder how they do that.
It looks like the client searches for the MBIDs when not present. See lines 158-159 here:
https://github.com/kawaiiDango/pano-scrobbler/blob/main/app/src/main/java/com/arn/scrobble/api/listenbrainz/ListenBrainz.kt
I’m not sure, though. But maybe that method could be used by Strawberry?