Information
This control determines whether passcodes other than 4-digit numbers are permitted for the passcode protecting access to the device via the touch screen. It is recommended that the device be configured to permit the use of passcodes longer than 4 characters and containing alphanumeric characters.
Solution
From the MobileIron console, open the Policies and Configs -> Policies view. Under the Security Policy verify that Password Type is set to Alphanumeric.