The bucket policy which I am trying to save is:
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AWSConfigBucketPermissionsCheck",
            "Effect": "Allow",
            "Principal": {
                "Service": "config.amazonaws.com"
            },
            "Action": "s3:GetBucketAcl",
            "Resource": "arn:aws:s3:::1-27-2021"
        },
        {
            "Sid": "AWSConfigBucketExistenceCheck",
            "Effect": "Allow",
            "Principal": {
                "Service": "config.amazonaws.com"
            },
            "Action": "s3:ListBucket",
            "Resource": "arn:aws:s3:::1-27-2021"
        },
        {
            "Sid": "Stmt1611805778285",
            "Action": "s3:GetObject",
            "Effect": "Allow",
            "Resource": "arn:aws:s3:::1-27-2021",
            "Principal": "*"
        }
    ]
}