Hello Sej,
The latest ZoneDirector code is v10.2.1 (MR1). Release notes list what SmartPhone operating systems were tested.
https://support.ruckuswireless.com/documents/2602-zonedirector-10-2-1-mr1-release-notes Smartphone/Tablet OS
• iOS (6.1, 7.0, 7.1, 8.1, 8.4, 9.2, 9.3,10.0,10.2,10.3,11.1/2/3/4,12.0 )
• Android (4.1.2, 4.2.2, 4.3, 4.4.2, 4.4.4, 5.0.1, 5.0.2, 5.1, 6.0, 7.0, 7.1.1, 8.0)
• Windows Phone (7, 8, 8.1, 10)
• BlackBerry OS (10, 10.3.2) not supported with Zero-IT
• Chrome OS (47.0, 49.0) not Supported with Zero-IT
Apparently, iOS 12.1 was not available yet. It will probably be supported in the next release(s).