Slack integration not finding a proper channel

[ajz]

Hello,
We are self-hosting a Metabase instance. We tried to add the Slack integration to send dashboard subscriptions to a channel, but unfortunately emitted messages are not sent properly.

We are sending the messages to metabase_files channel. As you can see in the screenshot below, the metabase_files channel is found via the Bot User (and that it has in fact access to list channels).

However, when I try to send the message to the given Slack channel, I get the following output in troubleshooting logs:

[728b06c8-2dd0-455a-8113-faf1dfaeb342] 2022-06-08T16:53:27+02:00 WARN metabase.integrations.slack {:error-code "channel_not_found",
 :message "Slack API error: channel_not_found",
 :response {:ok false, :error "channel_not_found"}}

The pulse test request in the browser seems to pass though:

Version of Metabase is v0.43.2. Should something additional be set up for the Slack integration to work?

[flamber]

Hi @ajz
Make sure that the App is member of the channel metabase_files
Seems like Slack has changed something in their API, which has again broken our integration, since this was handled automatically during the setup process we had created.

[ajz]

Yup, App is a member of the channel @flamber .

I see in Slack docs, that they are expecting the channel ID right now in https://slack.com/api/conversations.join requests [source].

So rather than passing the resolved name (metabase_files), they expect the internal identifier, such as C1234567890.

[flamber]

@ajz Yes. But then the App wasn't member until you used the internal identifier then.

[ajz]

[Resolved]

Ah, you're right - I added it and now seems to work.

For future reference, the solution was as @flamber suggested.

1. Add app to the channel via click "+" sign in message entry box in Slack:
   
   
2. Add Metabase App to the channel:
   
   

Thanks for help! There's nothing about adding the app to channel in public docs, so maybe I should contribute?

[flamber]

@ajz There has been way too many reports the last couple of days, so I've created an issue for this:
https://github.com/metabase/metabase/issues/23229 - upvote by clicking on the first post

[ajz]

Great, thanks!