Common Area Phone Setup (Shared Polycom Teams Phones) : Sequoyah Electric

User Account Setup

Each phone needs a user account set up with a "Common Area Phone" license

Once licensed, you'll need to assign the Common Area Phone (CAP) Policy

In PowerShell

Install-Module MicrosoftTeams
Import-Module MicrosoftTeams
Connect-MicrosoftTeams
Grant-CsTeamsIPPhonePolicy -Identity $Email -PolicyName 'CAP'

Once that policy is assigned any phone that user is signed in to will get the common area phone experience

To provision a device from the admin center you'll need; the device, the MAC address, the login details for the service account

Sign in at https://admin.teams.microsoft.com/devices/remoteProvisioning (This can also be found in the Teams admin center -> Devices -> Actions (top right) -> Provision Devices)
Click Add and enter the MAC address and location then click save
Select the device on the list and click "Generate Verification Code"
On the phone, once its at the Teams sign in page, click the gear and select "Provision device"
Enter the verification code from the admin center
Go back to the admin center and the device should now be in the "waiting for sign in" tab
Follow the prompts to to sign in the device remotely, it will require you to go to microsoft.com/devicelogin and enter the paring code followed by signing in to the service account
Go to Teams.Microsoft.com and configure the contacts list, anyone added to the speed dial will show up on the home screen