The minimum settings you need configured are (settings are examples)

REBOOT SCHEDULE FREQUENCY: DAYS

REBOOT SCHEDULE START DATE: WHEN TO START – I HAD DATE OF POLICY CREATION

REBOOT SCHEDULE TIME: 01:05 AM

SCHEDULE REBOOTS: ENABLED

You can troubleshoot if its applying in the registry of a machine that has the policy applied to here

HKLMSOFTWAREPoliciesCitrixIMARestart OptionsSchedule

References

http://support.citrix.com/article/CTX130232