Anthropic API Key added but "Couldn’t connect with these settings" error appears

[filontheroad]

Describe the problem/error/question

I added a new API KEy from our Athropic Account and i get red warning telling that the ressource could not be found. When i run a curl command calling the Anthropic API with the same api key i get a 200 OK reponse. So the API Key is working and correct.

What is the error message (if any)?

Couldn’t connect with these settings
The resource you are requesting could not be found

Please share your workflow/screenshots/recording

Share the output returned by the last node

There is no output because i can not use the new Anthropic Credential in any workflow because of the above error

Debug info

core

• n8nVersion: 2.11.2
• platform: docker (cloud)
• nodeJsVersion: 24.13.1
• 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/145.0.0.0 safari/537.36
• isTouchDevice: false

Generated at: 2026-03-11T12:36:44.817Z}

[n8n-assistant]

Hey @filontheroad,

Thank you for reaching out! We’ve received your issue and are looking into it. To help us track this internally, we’ve created a Linear ticket with the reference: "GHC-7228".

We’ll keep you updated as we make progress, but if you have any additional details or context to share, feel free to add them here - it’s always helpful!

Thanks for your patience and for bringing this to our attention.

---

For INTERNAL use only: GHC-7228

[BarryBahrami]

Same issue here. It was working until I updated to 2.11.4. I'm not sure from what, maybe one version prior. I had just updated it a week or two prior and it was working fine.

[BarryBahrami]

followup: The solution was to generate a new anthropic api key. 🤷‍♂️

It would be nice if we could configure a fallback model option in case one inference provider is down.

[dnwjn]

followup: The solution was to generate a new anthropic api key. 🤷‍♂️

It would be nice if we could configure a fallback model option in case one inference provider is down.

Interesting, I had just created a fresh key. I will try again with a new key and report back.

[AdamKessa]

Exact same issue here

[krisn0x]

Hey,

Thank you for bringing this up! It looks like this issue is a duplicate of #26637, You can follow that issue where we’re already tracking progress and updates. To keep things organized, we’ll close this issue and continue the discussion over there.

If you have any additional details or context that might help, please feel free to add them to the original issue. Your input is always appreciated!

Thanks again for your contribution, and let us know if there’s anything else we can assist with.

Best regards,
n8n Team