iOS Receiver w/APM & StoreFront 1.2

Yes, that is the one. What exactly is the error that you're getting with iOS? Also, what did you us to configure your Citrix environment? Did you use the latest iApp?

One thing I found out recently is that iOS client for some reason sense Accept-Encoding compression header, and if IIS is configured to process compression(it might) and sends compressed data in response to enum.aspx request, it will cause an error during account creation process. You can do a tcpdump to see if that's the issue on your end. if it is, you can add Accept-Encoding header to the list of headers to be removed in the HTTP profile assigned to your virtual, and it should solve that problem.

regardless, tcpdump data should greatly help troubleshoot this further.