bug: Nothing from listenbrainz - endpoint configured but not accepting

[psyciknz]

Please check existing knowledge before opening an issue

• I have read the Help docs
• I have checked the FAQ and documentation
• I have searched through existing issues and discussions.

Describe the Bug

(UA: Go-http-client/2.0) Received a well formed request to endpoint with -- Slug: (no slug) | Token: 4iC**** -- for the first time

LZE_ID=ListenbrainzListen
- LZE_TOKEN=${LISTENBRAINZ_ENDPOINT_TOKEN}
- LZE_ENABLE=true
- LZE_SLUG=1
- LZ_TOKEN=${LISTENBRAINZ_TOKEN}
- LZ_USER=${LISTENBRAINZ_USER}

I guessed the LZE-SLUG, has no idea what it should be, and the docs do not suggest a value or default.

What configuration types are you using for multi-scrobbler? Check all that apply.

• Environmental Variables (ENV)
• Individual Config Files
• All-In-One Config File

Platform

Docker

Versions

16.0

Logs

[2026-08-10 13:39:12.968 +1200] ERROR  : [App] [Scrobblers] Failed to validate Client maloja from ENV:
✖ Invalid input: expected string, received undefined
  → at MALOJA_ID
[2026-08-10 13:39:12.971 +1200] DEBUG  : [App] [Scrobblers] Found config file lastfm.json
[2026-08-10 13:39:12.977 +1200] ERROR  : [App] [Scrobblers] Failed to validate Client #1 (Name myLastFmSource) in lastfm.json:
✖ Invalid input: expected string, received undefined
  → at id
[2026-08-10 13:39:12.978 +1200] ERROR  : [App] [Scrobblers] Failed to validate Client lastfm from ENV:
✖ Invalid input: expected string, received undefined
  → at LASTFM_ID
[2026-08-10 13:39:12.988 +1200] ERROR  : [App] [Sources] Failed to validate Source plex from ENV:
✖ Invalid input: expected string, received undefined
  → at PLEX_ID
[2026-08-10 13:39:12.989 +1200] DEBUG  : [App] [Sources] Found config file lastfm.json
[2026-08-10 13:39:12.990 +1200] DEBUG  : [App] [Sources] Skipping Source #1 (Name myLastFmSource) in lastfm.json because it is configured as a Client
[2026-08-10 13:39:12.996 +1200] ERROR  : [App] [Sources] Failed to validate Source lastfm from ENV:
✖ Invalid input: expected string, received undefined
  → at SOURCE_LASTFM_ID
[2026-08-10 13:39:13.002 +1200] ERROR  : [App] [Sources] Failed to validate Source maloja from ENV:
✖ Invalid input: expected string, received undefined
  → at SOURCE_MALOJA_ID
[2026-08-10 13:39:13.003 +1200] DEBUG  : [App] Added Client Heartbeat task to scheduler
[2026-08-10 13:39:13.004 +1200] DEBUG  : [App] Added Retention Cleanup task to scheduler
[2026-08-10 13:39:13.004 +1200] INFO   : [App] Scheduler started.
[2026-08-10 13:39:22.951 +1200] INFO   : [App] [API] [Ingress] [Listenbrainz] [Ingress] [Listenbrainz Endpoint] Received request from a new remote address: ::ffff:172.15.5.15 (192.168.10.42) (UA: Go-http-client/2.0)
[2026-08-10 13:39:22.952 +1200] INFO   : [App] [API] [Ingress] [Listenbrainz] [Ingress] [Listenbrainz Endpoint] ::ffff:172.15.5.15 (192.168.10.42) (UA: Go-http-client/2.0) Received a well formed request to endpoint with -- Slug: (no slug) | Token: 4iC**** -- for the first time.
[2026-08-10 13:39:22.954 +1200] WARN   : [App] [API] [Ingress] [Listenbrainz] Received Listenbrainz endpoint payload but no Listenbrainz endpoint sources are configured
[2026-08-10 13:39:58.837 +1200] WARN   : [App] [API] [Ingress] [Listenbrainz] Received Listenbrainz endpoint payload but no Listenbrainz endpoint sources are configured
[2026-08-10 13:43:46.351 +1200] WARN   : [App] [API] [Ingress] [Listenbrainz] Received Listenbrainz endpoint payload but no Listenbrainz endpoint sources are configured

Play Debug Data

Additional Context

Reverted to version 15 image

[psyciknz]

the docs say:

LZE_SLUG | string |   | The URL ending that should be used to identify scrobbles for this source

But if I've using navidrome etc, I can't set that can i?

[psyciknz]

And on 16, all of these drop off

Can I migrate from env vars to a config? and is there a way of converting what I have in v15 to a config for 16 as there's obviously differences

[psyciknz]

On v 16, I can't see any acceptance of https://host/1 or https://host/lzslug (what I set the slug to)
reverted to 15 and removed LZ_SLUG env var and it works again.

[FoxxMD]

Thanks for the report. There are two things going on here:

Bug in 0.16.x for ENV

An oversight in the code for 0.16.0 was preventing ENV keys from using the correct prefix so yourLZE_* keys were not being recognized. Sorry! That's on me.

Try this docker image:

foxxmd/multi-scrobbler:pr-669

Confusing SLUG docs

The SLUG env is optional and only needed when either

• you want to have more than one Listenbrainz Endpoint Source and you can't distinguish them using token alone.
• OR the application making requests to MS won't use the standard LZ url structure and you need to make it completely custom.

In this case, using a slug like this LZE_SLUG=mySlug will make MS recognize requests for submit-listens on

http://myMultiScrobblerHost/api/listenbrainz/mySlug

It's kind of an option of last resort. A config with no slug should always be tried first. And I do my best to make sure MS will accept the "standard" LZ routes, and variants of them, from popular apps.

The current docs don't make that clear enough, I think. I'm currently rewriting them a bit to make this distinction clearer.

[FoxxMD]

For the second point, please take a look at these updated docs and let me know if the scenario guidance is clearer.

EDIT: I've cut a release with the above fix as I'm fairly confident this should resolve the issue. You can try updating your docker image to latest or 0.16.3

[psyciknz]

ok th e16.3 looks like it might get a listenbrainz listener going thanks.

Other thing I'm finding is it's quite picky about the vars being defined:
Invalid input: expected string, received undefined
→ at LFM_ID
[2026-08-11 08:10:55.218 +1200] ERROR : [App] [Sources] Failed to validate Source maloja from ENV:
✖ Invalid input: expected string, received undefined
→ at SOURCE_MALOJA_URL
✖ Invalid input: expected string, received undefined
→ at SOURCE_MALOJA_API_KEY

So i dont have maloja defined as a source but it still expects these. So rather than processing vars when needed it almost needs all defined to run:

environment:
      - TZ=Pacific/Auckland # Specify timezone from TZ Database name found here https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
      - PUID=1000
      - PGID=1000
      - INTDOMAIN=${INTDOMAIN}
      #- JELLYFIN_APIKEY=
      #- JELLYFIN_URL=
      #- JELLYFIN_USER=
      - DEBUG_MODE=true
      - SOURCE_MALOJA_ID=malojasource
      - SOURCE_MALOJA_ENABLE=false
      - MALOJA_ID=maloja
      - MALOJA_ENABLE=true
      - MALOJA_URL=http://maloja:42010
      - MALOJA_API_KEY=${MALOJA_API_KEY}
      - SOURCE_LASTFM_ENABLE=false
      - SOURCE_LASTFM_ID=lastfmsource
      - SOURCE_LASTFM_API_KEY=${LASTFM_API_KEY}
      - LASTFM_API_KEY=${LASTFM_API_KEY}
      - LASTFM_ID=lastfmclient
      - LASTFM_SECRET=${LASTFM_SECRET}
      - SOURCE_LASTFM_SECRET=${LASTFM_SECRET}
      - LASTFM_REDIRECT_URI=${LASTFM_REDIRECT_URI}
      - LFMENDPOINT_ENABLE=false
      - LFM_ENABLE=false
      - LZE_ID=LBListen
      - LZE_TOKEN=${LISTENBRAINZ_ENDPOINT_TOKEN}
      - LZE_ENABLE=true
      - LZENDPOINT_ENABLE=true
      - LZE_USERNAME=psyciknz
      - SOURCE_LZ_ID=LBSubmit
      - SOURCE_LZ_ENABLE=true
      - SOURCE_LZ_TOKEN=${LISTENBRAINZ_TOKEN}
      - SOURCE_LZ_USER=${LISTENBRAINZ_USER}
      - LZ_ID=LBUnsure
      - LZ_TOKEN=${LISTENBRAINZ_TOKEN}
      - LZ_USER=${LISTENBRAINZ_USER}
      - PLEX_ID=plex
      - PLEX_ENABLE=true
      - PLEX_URL=${PLEX_URL}
      - PLEX_TOKEN=${PLEX_TOKEN}
      - PLEX_USERS_ALLOW=${PLEX_USERS_ALLOW}
      - PLEX_LIBRARIES_ALLOW=${PLEX_LIBRARIES_ALLOW}
     ```

[psyciknz]

but it seems to be listening as a listenbrainz endpoint now, just verifying it till submit to last.fm maloja and listenbrainz at the end of the track

[FoxxMD]

Ah ok the errors you are seeing for maloja are because its checking ENV strings for a subset of the prefix (MALOJA) for clients instead of checking that the string begins with it...oops!

The LFM is because you have LFM_ENABLE=false but nothing else for LFM endpoint.

EDIT can try the edge image now which has a fix in it for the above behavior