Stacksets nopw appear to be region specific.

This is on a new account. i assume old accpunts didn't change but new ones going forward will be like this

Author: tmclaugh

stacksets/cfn-custom-resource-build/stackset.yaml

@@ -58,5 +58,6 @@ Resources:
               StringLike:
                 "aws:PrincipalArn":
                   - !Sub "arn:${AWS::Partition}:iam::*:role/ServiceCatalogCfnExecIamRole"
+                  - !Sub "arn:${AWS::Partition}:iam::*:role/ServiceCatalogCfnExecIamRole-us-east-*"
       Topics:
         - !Ref CustomResourceTopic