accessGrantsLocationId

The ID of the registered location to which you are granting access. S3 Access Grants assigns this ID when you register the location. S3 Access Grants assigns the ID default to the default location s3:// and assigns an auto-generated ID to other locations that you register.

If you are passing the default location, you cannot create an access grant for the entire default location. You must also specify a bucket or a bucket and prefix in the Subprefix field.