AWS s3 bucket policy invalid group principal

Question

This is a follow on from How can i enforce file type uploads with an AWS S3 bucket policy

When applying the bucket policy:

{
  "Version":"2008-10-17",
  "Statement": [
    {
      "Sid":"AddPerm",
      "Effect":"Allow",
      "Principal": { "AWS": "arn:aws:iam::111122223333:group/admins" },
      "Action": "s3:PutObject",
      "Resource": "arn:aws:s3:::bucket/*.txt"
    }
  ]
}

The group "admins" definitely exists, but I get the error: "Invalid principal in policy - "AWS" : "arn:aws:iam::111122223333:group/admins""

Why is it not recognised?

Answer 1

It's not possible to use groups in Principal at the moment. See https://forums.aws.amazon.com/message.jspa?messageID=356160