The Hub (aka Intelligent Hub) app is one of two apps that are installed automatically the first time each iPad is powered on. The Hub app is used to enroll the iPad (which installs all other apps). The Hub app requires iOS version 12.2, so if you are running an older version of iOS, you should upgrade as soon as possible.
If you open the Hub app, you can see the enrollment account ID and also the date and time when the app last checked in with Workspace ONE (if you do not see that, tap the left-pointing-arrow in the upper left corner of the screen).
You can also use the Hub app to test connectivity to Workspace ONE by tapping on This Device and then tapping Send Data.
If you open the Hub app and it prompts you to enter a username and password (the enrollment credentials), but you do not know what to enter, send an email to ipads@desalesmedia.org and include the serial number of the iPad.
If you do not see the Hub app on an iPad, open Settings and look in the upper left corner. You should see a message like this:
If you do not see a message like that, this iPad was not provided by or managed by DeSales Media.