You are receiving this message because your device does not currently meet UniSA mobile device security policies.
Staff wanting to access their University email from a mobile device are required to have a PIN or Password set on their device, this applies to both University owned as well as personally owned devices.
If your device does not have a PIN or Password enabled then you will not be able to access your University staff email.
Step by step instructions (including screenshots) on how to negotiate past the security message can be found on the Device Security message page.