stackSetRegions

One or more Amazon Web Services Regions where the provisioned product will be available.

Applicable only to a CFN_STACKSET provisioned product type.

The specified Regions should be within the list of Regions from the STACKSET constraint. To get the list of Regions in the STACKSET constraint, use the DescribeProvisioningParameters operation.

If no values are specified, the default value is all Regions from the STACKSET constraint.