Unable to create EFS volume via Cloudstor

I am trying to create shared EFS backed volume, by command from documentation:
$ docker volume create -d "cloudstor:aws" --opt backing=shared mysharedvol1

On CloudFormation setup page I have enabled support for the feature, but I still receive error:
Error response from daemon: create mysharedvol1: VolumeDriver.Create: EFS support necessary for backing type: "shared"

Error occurs only in region Frankfurt, where same setup in N.Virginia allows to mount EFS.

How can I mount EFS volume in that region?