Slack Integration – Channel Not Appearing After App Installation

[beratozdemir-del]

Hi team,

I’ve installed the Langfuse Slack app and completed the OAuth flow by clicking "Connect to Slack" in my Langfuse project settings. However, I do not see my Slack channel listed as an option for notifications.

The app is visible in my Slack workspace.
I have authorized it for the intended workspace and channels.

Could you advise on possible reasons why the channel does not appear in the list, or what steps I should take to resolve this?

Thank you!

[inkeep-ai-assistant[bot]]

Based on the available documentation, after installing the Langfuse Slack app and completing the OAuth flow via "Connect to Slack" in your Langfuse project settings, your Slack integration should allow you to configure notification channels per project and receive prompt change alerts in your Slack workspace(1)(2).

If your Slack channel does not appear as an option for notifications:

• Ensure the Slack app has been authorized for the correct workspace and channels.
• Confirm that the OAuth redirect URLs in your Slack app settings include the correct domain (for local development, this should be https://localhost:3000/api/public/slack/oauth; for production, your production domain must be used)(1).
• Verify that your environment variables (SLACK_CLIENT_ID, SLACK_CLIENT_SECRET) are correctly set in your environment and .env file(1).
• Make sure you have completed the OAuth flow without errors and that the app is listed as installed in both Slack and Langfuse project settings(1).
• Test the integration using the "Send Test Message" button in Langfuse project settings to verify connectivity(1).

If these steps do not resolve the issue, you can:

• Create a bug report on GitHub
• Ask a question to the maintainers
• Alternatively, contact support below

📚 Sources:

1. Slack Integration Setup Guide
2. Slack Integration for Prompt Webhooks - Langfuse

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Have another question? Just tag @inkeep.

[beratozdemir-del]

I see some channels on the list, and test the Slack integration with them and that's OK. But there's a lot of channels that I cannot see on the list.

[maxdeichmann]

Hi @beratozdemir-del,
thanks so much for reporting this. We are currently looking into this issue. We will update here once we found a fix for this.

[deejay1]

PR is in the works (#8470)

[maxdeichmann]

Hi @deejay1 thanks a lot for providing a PR for this. Thanks a lot!

[beratozdemir-del]

Thanks for implementing the fix that improves Slack channel listing in the automation UI — we can now see the full list of public channels. Much appreciated!

However, we’ve noticed that private channels where the Langfuse app has already been invited still do not appear in the channel picker.

Is this expected behavior, or should private channels (with the app invited) also be listed?

If not supported yet, is there a plan to include them in the future?

This would be helpful for teams that want to receive notifications in controlled or internal-use-only Slack channels.

Thanks again for your great support!

[maxdeichmann]

Hi we have a PR for this available but need some time to test this + get this live.

[maxdeichmann]

#8415

[maxdeichmann]

Hi, short update: our original PR does not fully resolve the issue. We need to prioritize this on our end to fix this properly.

[deejay1]

@maxdeichmann I have it somewhere in my pipeline to move the Slack channel fetching to a batch job, but unfortunately some EOY work tasks had priority and I hope to return to it in January if you don't have a solution by then ;)

[jannikmaierhoefer]

Adding @pylon to this thread

[wochinge]

I'm currently wrapping a PR that should address this: #13004
Estimating to get this out of the door by latest tomorrow

[wochinge]

We just released the fixed integration! I'll close the the thread for now - if you have more feedback let me know!