DMs stopped working after slack upgrade

[AdamBrousseau]

Jenkins and plugins versions report

Environment

Jenkins: 2.426.2
OS: Linux - 5.4.0-169-generic
Java: 11.0.16.1 - Eclipse Adoptium (OpenJDK 64-Bit Server VM)
---
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git:5.2.1
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zentimestamp:4.2

What Operating System are you using (both controller, and any agents involved in the problem)?

Ubuntu 20.04
Slack plugin version 684.v833089650554
Slack client version 4.35.131 64-bit

Reproduction steps

Pipeline code to send a direct message

slackSend channel: "${SLACK_HANDLE}", color: 'warning', message: "MY MESSAGE"

Expected Results

Works for channels. No longer works for Direct messages to users. This was noticed after our corporate slack was onboarded to the new interface in November (2023).
https://slack.com/help/articles/16764236868755-An-overview-of-Slacks-new-design

Actual Results

No message is sent, response null. This is from the Jenkins log (redacted sensitive info *****)

Jan 18, 2024 3:15:58 PM FINE jenkins.plugins.slack.StandardSlackService publish
Posting: to @***** on *****:  {"attachments":[{"fallback":"*****"}],"mrkdwn_in":["pretext","text","fields"]}],"link_names":"1","unfurl_links":"true","unfurl_media":"true","channel":"@*****","as_user":"true"}
Jan 18, 2024 3:15:58 PM WARNING jenkins.plugins.slack.StandardSlackService postToSlack
Slack post may have failed. Response: null
Jan 18, 2024 3:15:58 PM WARNING jenkins.plugins.slack.StandardSlackService postToSlack
Response Code: 400

Anything else?

No response

Are you interested in contributing a fix?

No response

[timja]

Have you tried sending that message to slack directly skipping Jenkins?

You haven't posted the full details of your integration, but if you are using bot user mode you can use this to test it in the UI:
https://api.slack.com/methods/chat.postMessage

[AdamBrousseau]

We are using the "Jenkins - CI" slack app. This is interesting

This app was made by Slack.

This app was made by a member of the Slack team to help connect Slack with a third-party service; these apps may not be tested, documented, or supported by Slack in the way we support our core offerings, like Slack Enterprise Grid and Slack for Teams. You may provide feedback about these apps at feedback@slack.com.

Also interesting from the page you linked

Post to a direct message channel
Posting to direct messages (also known as DMs or IMs) can be a little more complex, depending on what you actually are meaning to accomplish.

If you want your app's bot user to start a 1:1 conversation with another user in a workspace, provide the user's user ID as the channel value and a direct message conversation will be opened, if it hasn't already. Resultant messages and associated direct message objects will have a direct message ID you can use from that point forward, if you'd rather.

Bot users cannot post to a direct message conversation between two users using chat.postMessage. If your app was involved in the conversation, then it would be a multi-person direct message instead. Apps can post to direct message conversations between users when a shortcut or slash command belonging to that app is used in the conversation.

You will receive a channel_not_found error if your app doesn't have permission to enter into a DM with the intended user.

Passing a "username" as a channel value is deprecated, along with the whole concept of usernames on Slack. Please always use channel-like IDs instead to make sure your message gets to where it's going.

That deprecation link is from 2017 though so I don't think that is our issue.

What was happening before it broke, was a message was posted in your DM with the "slackbot" user [1], from the "jenkins-ci" APP[2]. Perhaps I need to send an email to Slack themselves?

[1]

[2]

[timja]

I would create your own bot app, that app you are using is a legacy and and some features don’t work with it