I assume that you are referring to a My Apps campaign? If so, then you should be able to manually invoke the "App Portal - Process Computers for My Apps Alerts" scheduled task on the App Broker server. It is a fairly time-consuming process typically, which is why it is scheduled to start over the weekend by default.
Also, if you just want to evaluate policies for a specific device, you can visit the My Apps tab on the App Portal website and select the desired device from the drop-down list. That will force immediate policy evaluation on just that one selected device, which is much less time/resource-intensive than running policies on all devices in your environment.
Anything expressed here is my own view and not necessarily that of my employer, Flexera. If my reply answers a question you have raised, please click "ACCEPT AS SOLUTION".
