Add the User to the IntuneApplications-FoxitPDF Azure group

Sign into the Foxit Admin dashboard https://adminconsole.foxit.com/dashboard - In the left pane, click License Management 

In License Management, in the top right, click Assign License 

In the Search bar, search for the user by their first and last name or TechID. Once found, select them and then click the plus sign to add them to the Selected List

Once the user(s) are in the Selected List pane, select the license to apply to them at the bottom of the screen & click OK.

Foxit will populate in Company Portal for Intune devices, it will need to be installed manually for domain devices from \\itsfiles\Software\Foxit PDF Editor Pro\USETHISONE Foxit Windows\USE ME - Foxit13