identityCenterArn

If you would like to associate your S3 Access Grants instance with an Amazon Web Services IAM Identity Center instance, use this field to pass the Amazon Resource Name (ARN) of the Amazon Web Services IAM Identity Center instance that you are associating with your S3 Access Grants instance. An IAM Identity Center instance is your corporate identity directory that you added to the IAM Identity Center. You can use the ListInstances API operation to retrieve a list of your Identity Center instances and their ARNs.