Not able to select Reboot

Not able to select Reboot

I just purchased a subscription for Zoho Assist. For some reason I can not select Reboot from the drop-down menu to reboot my user's computer. I was under the impression that I could choose this option and my user's computer would reboot and then reconnect with my computer after the reboot. However, both the Reboot and Safe Mode Reboot options are grayed out and do not work. How do I fix this?