Excel license terminal server - collection users vs app users

Hi all,

We are deploying two apps in terminal server Windows Server 2019 (app1 and app2). Both apps are in the same farm and collection.

The users from the collection use a user group, the same user group that the app1. Nevertheless, the app2 use another user group to limit who can use it.

the problem is that the app2 need to use Excel, only in this app. We want to use excel but we just want to pay only the app2 user group license (5 or 6 users), not the user group used in collection (more than 100 users). Is possible to pay only for the app2 group or need to pay to all connection group?

thanks and regards,

Gerardo,