How to Fix n8n OAuth2 Invalid Grant 🔁 Renew Expired or Revoked Refresh Token for Seamless API Access

Getting the “OAuth2 invalid grant” error in n8n? This usually means your refresh token has expired or been revoked. In this tutorial, I’ll show you how to fix it step-by-step by regenerating new tokens, reauthorizing your credentials, and preventing future token expiration issues for smooth and secure API connections.

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✅ What You’ll Learn / Fix:
⚙️ Why the OAuth2 invalid grant error happens
🔁 How to renew or refresh expired tokens
📲 How to reauthorize your credentials in n8n
💡 Tips to prevent token expiration or revocation

✅ Timestamps:
⏱️ 0:00 Intro
🧩 0:25 What causes the OAuth2 invalid grant error
🔁 1:00 How to generate new refresh tokens
📲 1:40 How to reauthorize in n8n and test connection
💡 2:20 Bonus tip – setting up long-lived tokens
✅ 3:00 Wrap-up

✅ Why Watch This Video:
🔧 Fix OAuth2 invalid grant errors quickly in n8n
🚀 Keep your API integrations running without interruptions
💡 Learn to manage and renew tokens securely

✅ Who This Helps:
💻 n8n users integrating OAuth2-based APIs
🔐 Developers maintaining long-term workflow connections
📱 Anyone facing expired or revoked refresh token issues

👍 Found This Helpful?
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