n8n - 💡(How to fix) Fix Duplicate workflow credentials error

<!-- Please follow the template below. Skip the questions that are not relevant to you. -->

Describe the problem/error/question

When duplicating a workflow, the cloned workflow fails to use credentials correctly in automated (trigger-based) executions, even though the same credentials work fine in manual execution and in the original workflow. I duplicated a working UK monitoring workflow to create a DE version. Both workflows reference the same credentials (IMAP, Anthropic, Slack). The original UK workflow runs automatically without issue. The duplicated DE workflow runs successfully when executed manually, but fails on automated trigger execution with credential errors on the IMAP, Anthropic, and Slack nodes.

What is the error message (if any)?

<img width="913" height="447" alt="Image" src="https://github.com/user-attachments/assets/99605e4a-03d7-4926-9eef-5a96fe32f588" />

Please share your workflow/screenshots/recording

<img width="1342" height="582" alt="Image" src="https://github.com/user-attachments/assets/d042e9c9-9dfb-4057-99e0-c05b2271e5eb" />

Share the output returned by the last node

None for last node, for last working node confidential

Debug info

core

• n8nVersion: 2.15.0
• platform: docker (self-hosted)
• nodeJsVersion: 24.13.1
• nodeEnv: production
• database: postgres
• executionMode: regular
• concurrency: -1
• license: enterprise (production)

storage

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

pruning

• enabled: true
• maxAge: 336 hours
• maxCount: 10000 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: 2026-06-05T15:32:51.524Z