When using Policies -> System Updates, you may want to view which specific devices need an update.
The Devices Needing column will only show the number of devices that actually need the specific update, but won't show the names of those devices.
However, you can click the on the name of the update in the Update column which will provide details for that update: the name, if a restart is required, and a full list of the devices that require it.
If you have an Addigy account and have additional questions, you can create a ticket by emailing firstname.lastname@example.org.
Alternatively, you can submit a support request within Addigy.