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Question

Zap with SendGrid API integration failing to create new contact records

  • December 15, 2025
  • 2 replies
  • 11 views

I have a Zap with 2 steps:

Step 1: Local application pushes data request to Zap via Webhook

Step 2: Zap uses SendGrid API to create new contact record and add to custom list

Step 1 appears to be working but Step 2 keeps throwing an error (I cannot see the specific error code because the Logs feature in Zapier is not working). Error text is:

“This SendGrid step hit an error

Authentication provided either does not exist or is not available to the user and account.”

 

Steps already tried to resolve:

  • Fixing JSON syntax and formatting
  • Deleting old API key and creating a new one with full access permissions in SendGrid

JSON query body text below:

{

"contacts": [

{

"email": "xxxxxxx.xxxxxxxx@gmail.com",

"first_name": "xxxxxx",

"last_name": "test"

}

],

"list_ids": ["123a7503-0bf0-46f4-a68e-2cec45ba913f"]

}

This post has been edited by a moderator to remove personally identifiable information (PII). Please remember that this is a public forum and avoid sharing personal or potentially sensitive details.

2 replies

Sparsh from Automation Jinn
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Hey ​@ggreenberg,

API’s are a more advanced way of using Zapier. I would recommend testing it in something like Postman to see if the API query is successful.

Here is a helpful article about Webhooks in Zapier- https://help.zapier.com/hc/en-us/articles/8496326446989-Send-webhooks-in-Zaps. Please also read the Sendgrid API documentation to understand the nuances- https://www.twilio.com/docs/sendgrid/api-reference. Hope it helps!


Troy Tessalone
Zapier Orchestrator & Solution Partner
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  • Zapier Orchestrator & Solution Partner
  • December 16, 2025

Hi ​@ggreenberg 

For us to have more info, post screenshots showing how your Zap step API Request is configured along with the encountered error.

  • Method
  • URL
  • Body
  • Headers

 

Zap action: SendGrid - API Request