n8n - 💡(How to fix) Fix Issue connect OpenAI credentials in n8n Cloud [2 comments, 3 participants]

I cannot connect OpenAI credentials in n8n Cloud.

I created a new OpenAI API key in the OpenAI Platform and pasted it into the OpenAI credentials field in n8n.

When I try to test/connect the credentials, n8n returns an error before I can use the OpenAI node.

Organization ID is empty. Base URL is default. I did not add any custom headers. The API key is new and valid.

<img width="1030" height="306" alt="Image" src="https://github.com/user-attachments/assets/39fd42d3-2f06-4be1-9378-b26a660415a8" />

Couldn't connect with these settings

config.headers.setContentType is not a function

core

• n8nVersion: 2.19.5
• 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 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/146.0.0.0 safari/537.36 opr/130.0.0.0
• isTouchDevice: false

Generated at: 2026-05-10T15:41:09.035Z

Could you please check if this is related to the known n8n 2.19.5 regression with OpenAI/HTTP Request headers?

<img width="1030" height="306" alt="Image" src="https://github.com/user-attachments/assets/14aaf9ec-3485-49ba-9963-e23c7a1c0f82" />