Trying to add a secondary Storefront server came up with an error during propagation of settings : 

Failed to get the end status of the sever configuration update.
System.ServiceModel.FaultException, System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Access to the path ‘C:\Program Files\Citrix\Receiver StoreFront\Receiver Clients\Windows\CitrixReceiver.exe’ is denied.
at Citrix.DeliveryServices.ConfigurationReplication.WCF.ConfigurationReplication.EndUpdateConfiguration(IAsyncResult asyncResult)

Looks like the same issue as https://pariswells.com/blog/research/import-stfconfiguration-an-error-occurred-configuring-storefront-diagnostics-method-invocation-failed-because

Deleting : C:\Program Files\Citrix\Receiver StoreFront\Receiver Clients\Windows and \Mac Fixed this issue