Architect Data Action: Lambda Invoke returns 403 Forbidden

Architect & Flows
1

Setting up a Data Action to invoke a Lambda function from Architect. The integration works fine in Postman, but Architect throws a 403. I’ve checked the IAM role attached to the Data Action and it has lambda:InvokeFunction permission.

Here’s the policy snippet:

{
 "Effect": "Allow",
 "Action": ["lambda:InvokeFunction"],
 "Resource": "arn:aws:lambda:us-east-1:123456789:function:my-func"
}

Still getting the error. What am I missing?