Sendgrid credential: claims wrong API Key.

[tzur]

Describe the problem/error/question

When adding Sendgrid credential on self-hosted n8n it always fails to authenticate.

What is the error message (if any)?

Couldn’t connect with these settings
Forbidden - perhaps check your credentials?

Please share your workflow/screenshots/recording

(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.

Debug info

core

• n8nVersion: 1.104.2
• platform: npm
• nodeJsVersion: 22.17.0
• database: postgres
• executionMode: regular
• concurrency: -1
• license: enterprise (production)

storage

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

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/138.0.0.0 safari/537.36
• isTouchDevice: false

Generated at: 2025-08-04T13:42:00.773Z}

[Joffcom]

Hey @tzur,

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-3506".

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.

[Joffcom]

Thank you for taking the time to submit this issue! Unfortunately, it looks like the issue template hasn’t been fully completed. The template is crucial because it helps us understand the problem better and resolve it more efficiently.

We’ll go ahead and close this issue for now. If you’d still like assistance, please feel free to reopen the issue after filling out the required information in the template. Alternatively, you can create a new issue using the template to provide the missing details.

We appreciate your understanding and look forward to assisting you further once we have all the necessary information!

[Joffcom]

Hey @tzur,

Does your SendGrid credential have permission to access /marketing/contacts?

[Joffcom]

As we haven’t heard back from you, we’re going to close this issue to keep things organized. But don’t worry, if you have more information or need further assistance, you’re welcome to reopen the issue anytime or create a new one. We’re always happy to help!

Thanks for reaching out and have a great day! If this was closed by mistake and you have been waiting for us let me know and I can also re-open it.