
Hi Rajas,
Licenses is user based, and what there is assigned to a specific user is what features there is available for the specific user.
And yes, the licensing for Microsoft 365/Office 365 features can indeed be a bit complex :)
Here is an overview here (not official Microsoft page, but gives a nice overview): https://m365maps.com/
Regarding the users and how to assign licenses is descripted here: https://learn.microsoft.com/en-us/entra/fundamentals/license-users-groups and how it works in general here: https://learn.microsoft.com/en-us/microsoft-365/admin/manage/assign-licenses-to-users?view=o365-worldwide
Let me hear if you have more questions or this was helpful.
So if I understand your question correct: Yes, they need all the license.