The "PowerApps per user license" enhances standard PowerApps capabilities by enabling premium connectors, allowing connections to Enterprise Data in both on-prem and Azure, and to Dataverse without Teams. The "per user license" is required to access any app that is created using these features. However, many free connectors are available even without this license. The table pictured below gives an overview of the expanded features of this plan (table taken from page 5 of this PDF (link)):
The table below is just an image. To follow the links, see the PDF link above and go to the table on page 5.
For PowerApps help in setting up environments, Portals, Dataverse Tables, or Data Gateways, please contact the IT Service Desk to create a ticket.