Licenses are tied to the user accounts which sign into the collaboration bar. You can use either a regular user account which often has an E3 license or something similar, or use a dedicated resource account with a Meeting Room license, which would be the most common and cost-effective.
As long as the base license you assign includes Microsoft Teams then it'll work. Whether or not additional licenses are assigned to the account (like Phone System) will impact what capabilities the device may have.
-----------
Jeff Schertz - Principal Microsoft Solutions Architect [Blog]Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
