Hi @SQ Hon , welcome to Community!
In the repo settings, you can configure which events trigger a Slack notification:
You'll notice that these events can be selected per-branch or repo-wide. My guess is that the pipeline fixed event is not selected for the branch (or whole repo) in question. You can simply start typing the event name in the Notifications box and select the pipeline fixed event in the branch/repo you need the notification on.
If you need it, we've also got some documentation on how the Slack notifications are configured.
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