Hi Becky,
> Can we use Workforce or Tracker with named users from ArcGIS Hub Premium?
ArcGIS Hub Premium includes two ArcGIS Online organizations.
What is ArcGIS Hub?—ArcGIS Hub | Documentation
(see how it works section)
You can certainly use Workforce for ArcGIS with the ArcGIS Online organization(s). Currently, Tracker for ArcGIS is only supported with ArcGIS Enterprise - but it should be available with the forthcoming ArcGIS Online Dec 2019 update.
Location Tracking is coming to ArcGIS Online
Hope this helps,
