ErrorType=MissingAuthenticationTokenException and missing documentation to update the IAM role

[ykbryan]

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What is the current behavior?

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. Your bug will get fixed much faster if we can run your code and it doesn't have dependencies other than AWS Amplify.

I am using Amplify for one of the RN workshop but I am facing errors.
Setup appsync via awsmobile commands:

awsmobile appsync enable
awsmobile appsync configure

Choose IAM_TYPE

However, there is no result and error on the react native console. This is what I saw in the AWS CloudWatch logs:

6fe1ecd5-fe5c-4036-8dfe-2fdfe8000bc2 Begin Request
6fe1ecd5-fe5c-4036-8dfe-2fdfe8000bc2 Request Headers: {content-length=[158], cloudfront-viewer-country=[SG], x-forwarded-proto=[https], accept-language=[en-us], x-forwarded-port=[443], x-forwarded-for=[54.240.199.105, 204.246.166.79], via=[2.0 3d1e30eb4cc84a00e30ba5e6b067e3f7.cloudfront.net (CloudFront)], accept=[application/json, text/plain, */*], cloudfront-is-smarttv-viewer=[false], x-amzn-trace-id=[Root=1-5b5948a6-4460ffe835740938d33d82e8], cloudfront-is-desktop-viewer=[true], cloudfront-is-tablet-viewer=[false], host=[**REMOVED**.appsync-api.ap-southeast-1.amazonaws.com], content-type=[application/json; charset=UTF-8], cloudfront-forwarded-proto=[https], x-amz-cf-id=[EVT2bubxT4_M7T9sj7qwH23SS1X5vH8bfui81m5piucAKS3xy1TgCA==], accept-encoding=[br, gzip, deflate], user-agent=[aws-amplify/0.4.x react-native], cloudfront-is-mobile-viewer=[false]}
6fe1ecd5-fe5c-4036-8dfe-2fdfe8000bc2 Response Headers: {x-amzn-ErrorType=MissingAuthenticationTokenException}
6fe1ecd5-fe5c-4036-8dfe-2fdfe8000bc2 End Request

I followed the exact steps and documentations provided in the AWS Amplify doc (https://aws-amplify.github.io/amplify-js/media/api_guide#using-aws_iam)

What is the expected behavior?

I should be able to get a list of data from graphQL query.

Which versions of Amplify, and which browser / OS are affected by this issue? Did this work in previous versions?

    "aws-amplify": "^1.0.2",
    "aws-amplify-react-native": "^1.0.2",
    "react": "16.3.1",
    "react-native": "~0.55.2",

You can turn on the debug mode to provide more info for us by setting window.LOG_LEVEL = 'DEBUG'; in your app.

There is no result and error on the react native console.

[ykbryan]

I got it working by updating the IAM Role that AWS Mobile Hub has auto-provisioned.
Attaching screenshot for reference.

Missing AppSync IAM policy

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