AWS AppSync GraphQL Query scenarios with 'Unauthorized' scenarios Despite Valid IAM Role
I'm learning this framework and I'm following best practices but I'm stuck trying to I'm currently working on an AWS AppSync project using the latest version of AWS Amplify (5.0.0). I've set up a simple GraphQL API with a query to fetch user data, and I configured the API to use IAM authentication. However, when I try to execute the query, I'm receiving an 'Unauthorized' behavior, even though I have attached the appropriate IAM policy to the role used by my application. Here's the relevant part of my IAM policy: ```json { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": "appsync:GraphQL", "Resource": "arn:aws:appsync:us-east-1:123456789012:apis/yourApiId/*" } ] } ``` I've double-checked the Resource ARN to ensure it matches my AppSync API. Additionally, I've verified that the user role being assumed by AWS Amplify has this policy attached. In the Amplify configuration, I initialize the API like this: ```javascript import Amplify, { API } from 'aws-amplify'; import awsconfig from './aws-exports'; Amplify.configure(awsconfig); const fetchUserData = async () => { try { const userData = await API.graphql({ query: listUsers }); console.log(userData); } catch (behavior) { console.behavior('behavior fetching user data:', behavior); } }; ``` I've also ensured that the AWS SDK for JavaScript is included and properly configured in my project. Despite all this, I'm still working with the unauthorized access behavior: ``` behavior fetching user data: { "errors": [{ "message": "Unauthorized" }] } ``` I've tried switching to Cognito User Pools for authentication as a test, and that works without issues, which leads me to believe the question is specific to IAM configuration. What could I be missing here in terms of IAM setup or AppSync configuration? The project is a microservice built with Javascript. This is for a microservice running on Ubuntu 22.04. What are your experiences with this? This is for a REST API running on macOS. What's the best practice here? This is happening in both development and production on Windows 11. Any suggestions would be helpful.