New R500 Zoneflex setup running 200.1.9.12.62, iPhones andiPads cannot Join a (hidden SSID network. Windows, MacOS and Android devices can.

[dan_martich]

New R500 Zoneflex setup running 200.1.9.12.62, iPhones and iPads cannot Join a closed (hidden SSID) network. Windows, MacOS and Android devices can. Please help!

Also using ACL for MAC address filtering.

When I unhide the SSID the iOS devices can join just fine.  One iOS device is running iOS 9.3.4 another is running 9.3.5