How to create a public Multi-Region Access Point policy?

I am experimenting with multi-region access points and their over-complicated policy syntax, and I can't get the simplest things to work.

I have 3 buckets spawned across the globa and created a single access point. All my items are private as my multi-region access point policy is not configured yet.

So far I have this:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": "*"
            },
            "Action": "s3:GetObject",
            "Resource": [
                "arn:aws:s3::<my account id>:accesspoint/xyz.mrap"
            ],
            "Condition": {
                "StringEquals": {
                    "s3:DataAccessPointAccount": "<my account id>"
                }
            }
        }
    ]
}

The error indicated states:

Action does not apply to any resource(s) in statement

Their example uses "Action" : "*", but I want to limit this.

Can anyone help out what is wrong with my policy?

s3:GetObject applies to objects only. Your arn:aws:s3::<my account id>:accesspoint/xyz.mrap represents access point, not its objects. Thus it should be:

            "Resource": [
                "arn:aws:s3::<my account id>:accesspoint/xyz.mrap/*"
            ],