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Plan requirement: IM integration requires an On-call Pro or higher subscription. Learn more

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1. Install App

1

Add Integration

Go to Flashduty On-call Integration Center → Instant Messaging → Slack, click Add.
2

Authorize App

On the redirected Slack page, select Workspace in the top right corner, then click Allow.2025-09-18-15-03-58
3

Save Configuration

Enter data source name, click Save.

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2. Configure War Room

After completing the previous steps, in the Flashduty On-call integration configuration page’s Enhanced Features section, check Enable War Room to activate this feature—no additional configuration needed.
To enable AI-generated post-mortem with war room chat history, the app requires additional channels:history permission. For existing Slack integrations, you need to manually re-authorize to grant this permission.

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3. Linked Users

In the Linked Users tab of the integration detail page, you can view the linking status between team members and Slack accounts, and quickly complete batch linking.

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View Linking Status

The linked users list shows all team members and their linking status. You can filter by:
FilterDescription
AllView all team members
LinkedView only members who have linked their Slack accounts
UnlinkedView only members who have not yet linked their Slack accounts
Search by name or email is supported.

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One-Click Linking

When unlinked members exist, click the One-Click Link button. The system will attempt to obtain Slack account IDs via phone numbers or emails and automatically link them, equivalent to members logging into Flashduty using the same information on Slack.
The system can only push Slack message notifications after members complete linking. If linking fails, verify that the member’s email matches their Slack account.

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4. FAQ

  • Only one IM integration can have War Room enabled at a time. If you have already enabled War Room in another IM integration (such as Dingtalk, Feishu/Lark, or WeCom), you need to disable it there first before enabling it in the current Slack integration
  • When enabling War Room, the system automatically verifies whether the current Slack app has all required permissions. If missing permissions are detected, a warning message appears on the page with a Re-authorize link
  • Click the Re-authorize link to be redirected to the Slack authorization page, which requests additional permissions needed for War Room functionality (including channel management, message read/write, user info reading, etc.). After completing authorization, the page automatically returns to Flashduty
  • If your Slack integration was authorized before the War Room feature was released, you will typically need to re-authorize on first use to add the new permissions. Re-authorization does not affect your existing integration configuration or user associations
  • Ensure the Install App step completed successfully without errors
  • Go to the relevant Slack channel, execute /invite @Flashduty command
  • When you see joined or added by xxx to xxx prompt, it means successfully added
  • Add the app authorizer to the public channel
  • Follow the method from the previous question to add the app to the channel
Please try again. This may be due to server-Slack communication exception causing authorization failure. Return to the add data source page and retry. If the error persists after retry, please contact customer service.
Please try again. This may be due to Flashduty server communication exception with Slack when obtaining permanent authorization code. Return to the add data source page and retry. If the error persists after retry, please contact customer service.
Please try again, this may be a temporary Slack service issue. If the error persists after retry, please contact customer service.
Please try again. This may be server-Slack communication timeout. If the error persists after retry, please contact customer service.
Please try again. This may be a Flashduty On-call server error (e.g., data source was disabled). If the error persists after retry, please contact customer service.
Please try again. If the error persists after retry, please contact customer service to log and resolve new issues.
  • For previously authorized Slack IM integrations, you need to manually re-authorize Slack in the Flashduty On-call integration configuration page for the app to obtain additional permissions required for War Room functionality
  • See the FAQ section in War Room documentation