400 Error: UNPROCESSABLE_ENTITY when creating envelope from template via API (using n8n + OAuth2)

Hi everyone,

I’m trying to send an envelope using the DocuSign eSignature REST API from an n8n automation workflow, but I’m getting a 400 - UNPROCESSABLE_ENTITY error when using a template.

Here’s the full request body I’m sending:

{
  "emailSubject": "Please sign this document",
  "templateId": "b19401de-25af-426b-addc-c290c0ef0753",
  "templateRoles": [
    {
      "email": "abc@gmail.com",
      "name": “Group",
      "roleName": "BCBA"
    }
  ],
  "status": "sent",
  "eventNotification": {
    "url": "",
    "loggingEnabled": true,
    "requireAcknowledgment": true,
    "envelopeEvents": [
      {
        "envelopeEventStatusCode": "Completed",
        "includeDocuments": true
      }
    ]
  }
}


 

And here’s the error response:

400 - {"errorCode":"UNPROCESSABLE_ENTITY","message":"The entity could not be processed."}

Request details:

• Endpoint: https://demo.docusign.net/restapi/v2.1/accounts/a66ffa71-c12f-4cab-b5ae-854d3c378e3f/envelopes

• Auth type: OAuth2 (Authorization Code grant)

• Integration tool: n8n

• Environment: Developer (demo)

• Account type: Developer account (no templates created directly in this account; the template is from another connected DocuSign account)

What I’ve checked:

• The role name (“BCBA”) matches exactly with the role defined in the template.

• The email and name fields are valid.

• The API call is properly authorized with a valid access token.
   

Question:

Could this error be due to using a template from another account (not the one the OAuth token belongs to)?
Or is there any specific field or configuration I might be missing in the API body?

Any help or insights from others who have faced this issue would be appreciated! 🙏

Thanks in advance,