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n8n - 💡(How to fix) Fix MCP OAuth2 authentication is not automatically refreshed by n8n

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Error Message

Describe the problem/error/question

What is the error message (if any)?

  • error: all

Code Example

(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.
RAW_BUFFERClick to expand / collapse

Describe the problem/error/question

When using a MCP (Higgsfield in my example) with OAuth2 authentication, the token gets expired after x amount of time (e.g. 12 hours) and is not refreshed by N8N. It requires manually reconnecting the MCP OAuth authorization in n8n.

What is the error message (if any)?

NA

Please share your workflow/screenshots/recording

NA

(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

<!-- If you need help with data transformations, please also share your expected output. -->

NA

Debug info

AN

core

  • n8nVersion: 2.20.7
  • platform: docker (cloud)
  • nodeJsVersion: 24.14.1
  • nodeEnv: production
  • database: sqlite
  • executionMode: regular
  • concurrency: 5
  • license: enterprise (sandbox)

storage

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

pruning

  • enabled: true
  • maxAge: 168 hours
  • maxCount: 2500 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: 2026-05-21T07:54:08.121Z

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n8n - 💡(How to fix) Fix MCP OAuth2 authentication is not automatically refreshed by n8n