I’ve been getting an error following whenever I try to deploy my app on AWS Amplify:

Unable to assume specified IAM Role. Please ensure the selected IAM
Role has sufficient permissions and the Trust Relationship is
configured correctly.

I’ve tried a solution found in Stack Overflow:
Unable to assume specified IAM Role when deploying with AWS Amplify using GitHub

I modified Trust Relationship like below:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "Service": [
                    "amplify.amazonaws.com",
                    "amplify.ap-northeast-2.amazonaws.com"
                ]
            },
            "Action": "sts:AssumeRole"
        }
    ]
}

However, it didn’t work for me. I still get the same error message.

Is there any other solution for this? It occurs on build process.