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Fix HubSpot → Slack Sync Issues (Not Working, Errors, Duplicates)

🔧 2 Common Issues

Diagnose and resolve common sync problems. We've documented the 2 most common issues, their root causes, and exactly how to fix them. See step-by-step fixes for duplicates, missing fields, rate limit errors, and connection issues.

critical High Frequency

New HubSpot leads aren't triggering Slack notifications

Also searched as: "HubSpot Slack new hubspot leads aren't triggering slack notifications"

#1 Webhook Subscription Expired 60% likely

📋 How to Diagnose

  1. 1. Check HubSpot > Settings > Integrations > Webhooks
  2. 2. Verify if the Slack notification webhook is still active
  3. 3. Look for recent delivery failures in the webhook logs

✓ Solution

Recreate the webhook subscription with a new secret key

⏱️ Est. time: 15 min

#2 Contact Property Filter Mismatch 30% likely

📋 How to Diagnose

  1. 1. Check the Slack notification workflow in HubSpot
  2. 2. Verify if the 'Contact Created' trigger includes all lead sources
  3. 3. Confirm that custom lead properties are properly mapped

✓ Solution

Update the workflow filter to include all relevant lead sources and property criteria

⏱️ Est. time: 10 min

#3 Slack App Permissions Revoked 10% likely

📋 How to Diagnose

  1. 1. Check Slack app permissions in your workspace
  2. 2. Verify if the HubSpot Slack app has channel posting permissions
  3. 3. Look for any recent permission changes

✓ Solution

Reinstall the HubSpot Slack app with appropriate permissions

⏱️ Est. time: 5 min

View Setup Guide
high Moderate Frequency

Slack channel flooded with duplicate HubSpot notifications

Also searched as: "HubSpot Slack slack channel flooded with duplicate hubspot notifications"

#1 Duplicate Workflow Triggers 70% likely

📋 How to Diagnose

  1. 1. Check HubSpot > Automation > Workflows
  2. 2. Look for duplicate Slack notification workflows
  3. 3. Verify if workflows have overlapping trigger conditions

✓ Solution

Deactivate duplicate workflows and refine trigger conditions

⏱️ Est. time: 10 min

#2 Webhook Retries 20% likely

📋 How to Diagnose

  1. 1. Check webhook delivery logs for retries
  2. 2. Look for 5xx errors or timeout responses
  3. 3. Verify if the Slack API was unavailable during failures

✓ Solution

Add a deduplication check using contact IDs in your automation

⏱️ Est. time: 20 min

View Setup Guide

Step 1: Try the Official Integration

Direct connection

Start with the native integration if available. It's usually the most reliable, but may have limitations.

View Setup Guide

Free with your subscription

Step 2: Use Make for Custom Flows

No code automation

Create custom integration workflows with Make's visual designer. It works with almost any API.

Try Make Free →

1000 ops/mo free. No credit card.

Step 3: Self-Hosted with n8n

Full data control

Need complete data privacy? n8n is open-source and self-hostable. Build custom integrations with full control over your data.

Try n8n Free →

Open source. Self-host or cloud. Unlimited ops.

Step 4: Add Human Review

Approval automation

Relay adds human-in-the-loop approvals, Slack/Teams alerts, and conditional logic to your automation.

Try Relay Free →

1000 actions/mo free. No credit card.