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Question

Why doesn't Slack pick up thread replies in private channels?

  • April 20, 2026
  • 4 replies
  • 31 views

For some reason slack does not pick up thread replies in private channels but works in public, any idea if this is config issue or why ?

4 replies

Troy Tessalone
Zapier Orchestrator & Solution Partner
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  • Zapier Orchestrator & Solution Partner
  • April 20, 2026

Hi ​@rohannarula 

Help links for using Slack in Zaps: https://zapier.com/apps/slack/integrations#help

 

How to trigger Zaps from Slack thread messages

https://help.zapier.com/hc/en-us/articles/36083516665229-How-to-trigger-Zaps-from-Slack-thread-messages


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  • Zapier Solution Partner
  • April 20, 2026

Hy ​@rohannarula 

This is a configuration issue, not a limitation. Here's the fix:

Documentation: Link

Use the "New Message Posted to Private Channel" trigger instead of "New Message Posted to Channel."

  • The public channel trigger only works for public channels

  • The private channel trigger captures all messages in private channels, including thread replies

The trigger explicitly includes messages in threads.

If you only want thread replies (not main messages), add a Filter step:

  • Condition: Thread Ts does not exactly match Ts

  • This works because thread replies have different values; main messages have matching values

Known bug: May fail if user checks "Also send to channel" when replying. Zapier is working on this.

Hope this helps you get it sorted!

If you're still stuck, I offer a free 20-min Zapier troubleshooting call. Book it through my Zapier Directory profile — it's listed under Resources on the left side: https://zapier.com/partnerdirectory/automatemybiz!-->


  • Author
  • New
  • April 21, 2026

Thanks let me give this a whirls! 


SamB
Community Manager
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  • Community Manager
  • April 28, 2026

Hey there ​@rohannarula 👋 Did the guide and suggestions from Troy and Fahad help you to get the Zap to access the threaded replies in private channels?

If you got it sorted, would you be up for sharing what the solution was in your case? This would be super helpful to others that might be facing the same issue.

And if you’re still stuck at all, just let us know. Want to make sure this gets sorted! 🙂