N8n Activation Key Is In The Wrong Format [exclusive] Jun 2026

If you are pasting the key and it still fails, you may have copied an invisible "space" at the beginning or end of the string.

: In some technical environments, the n8n License SDK may return a 400 error if it expects a specific "UUID" format but receives something else due to localized server settings. 2. Immediate Steps to Fix the Error Before contacting support, try these solutions in order: n8n activation key is in the wrong format

curl -X POST http://localhost:5678/api/license \ -H "Content-Type: application/json" \ -d '"licenseKey": "n8n-ent-3Fg7Hj2Lk9Qw4RtY"' If you are pasting the key and it

: You can bypass the UI entirely by setting an environment variable in your Docker or server config: N8N_LICENSE_ACTIVATION_KEY=your-key-here n8n activation key is in the wrong format