n8n - 💡(How to fix) Fix webhook-waiting resumeUrl returning 'Invalid token' — possible regression (ref: GitHub #18610) [2 comments, 3 participants]

Hi n8n support team,

I'm experiencing an issue on my n8n Cloud instance where clicking a button that triggers a webhook-waiting resume URL returns {"error":"Invalid token"}.

Instance: https://recharge-marketing.app.n8n.cloud n8n Version: 2.17.5 Workflow ID: Sg9l7ZWxo7Mgb0us (now renamed to 'Prod - AI - CRM - Campaign Content Generator GDrive & Slack + Memory')

Describe the problem/error/question

• My workflow uses Wait nodes (resume: webhook) to pause execution until a user clicks a button in Slack
• The Slack message contains a link button with the $execution.resumeUrl as the URL

What is the error message (if any)?

• When the user clicks the button, the browser opens the resume URL and n8n returns {"error":"Invalid token"}
• The execution is still in a 'Waiting' state when the button is clicked

What changed:

• This was working correctly yesterday (22 April)
• It stopped working today (23 April) without any changes to the workflow or credentials
• All other parts of the workflow (Slack posting, Google Docs creation, Gemini API calls) continue to work fine
• Only the webhook-waiting resume URL is affected

This appears to match the behaviour described in GitHub issue #18610 (sendAndWait broken with missing/invalid token), where webhook-waiting URLs return 'Invalid token' after a platform update.

Could you please check:

1. Whether my instance received an update between yesterday and today
2. Whether this is a known regression in v2.17.5
3. Any recommended workaround or fix

Happy to provide execution IDs or additional details if needed.

Thanks, Santiago

Please share your workflow/screenshots/recording

(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)
⚠️ WARNING ⚠️ If you have sensitive data in your workflow (like API keys), please remove it before sharing.

Share the output returned by the last node

Debug info

core

• n8nVersion: 2.17.5
• platform: docker (cloud)
• nodeJsVersion: 24.14.1
• nodeEnv: production
• database: sqlite
• executionMode: regular
• concurrency: 20
• license: enterprise (sandbox)

storage

• success: all
• error: all
• progress: false
• manual: true
• binaryMode: filesystem

pruning

• enabled: true
• maxAge: 720 hours
• maxCount: 25000 executions

client

• userAgent: mozilla/5.0 (macintosh; intel mac os x 10_15_7) applewebkit/537.36 (khtml, like gecko) chrome/147.0.0.0 safari/537.36
• isTouchDevice: false

Generated at: 2026-04-23T13:28:24.612Z