Load-balancing Citrix CloudGateway Express/StoreFront

I've got this working in our environment with redundant Cloud Gateway Express hosts load balanced by the F5 with APM and the web receiver is working great, but we aren't able to connect users on iPads and other client receivers. We get an error:

 

 

Access Gateway: Gateway authentication failed. Please check your credentials, address, gateway settings and network connection.

 

 

I reached out to my F5 engineer that had helped me with the setup and he had me add the following new iRules->Data Group:

 

 

APM_Citrix_ConfigXML

 

Type: String

 

For the single record in the group:

 

 

String: myname.domain.com

 

Value: /Citrix/Name/PNAgent/config.xml

 

 

And enable Legacy mode on the Cloud Gateway Express.

 

 

Unfortunately this didn't correct the problem. Is there something I'm still missing? The Cloud Gateway Express authentication is currently set for only "Username and Password". Do I need to enable Pass Through or another method?

 

 

Thanks In Advance