Devices require live and correct subscriptions in order to work properly.

In your DISPL Content Management System, please open the Devices tab.


The column named "Subscriptions" shows a list of the subscriptions set for your devices.
The ones that say "Not set" are unable to collect analytics.
If a subscription is said to be "Expired" it is unable to collect analytics.
If the subscription is "Screen Management" it is unable to collect analytics.

If you don't know how to change subscriptions check this article.