Get your Microsoft Teams presence information from Graph API using an Azure AD App with PowerShell

GetTeamsPresenceViaMsGraphApi.ps1

<#
1. Logged on as a Global Administrator, create a new "App-registration" in Azure AD.
2. Add a Redirect URI. This can point to any web location you like as it isn't used.
2. Add "API permissions" for "Microsoft Graph" to the app for "Presence.Read" and "Presence.Read.All" (Must be delegated).
3. Grant admin consent for the organisation (click the button)
3. Add a new "Secret" to the app which can be used to retrieve a token for the app. Remember to copy the secret!
#>

$clientID = '8806ac69-edde-4069-8128-c01c3aa84eda' # This is the "Application (client) ID" of the application which is granted permission to read presence.
$tenantName = "mytenant.onmicrosoft.com" # This is the name of the tenant for Azure AD.
$ClientSecret = 'qR[QXJ-xB6LjlpZkc[jM]6tB5R4bvebY' # Expires: 03/04/2021. This is the secret (from Certificates & Secrets of the 'Graph' application (app registration)).
$Username = "[email protected]" # The UPN of a user with access to Azure AD - probably you!
$Password = 'StrongPassword1!' # The password of that user.


$ReqTokenBody = @{
    Grant_Type    = "Password"
    client_Id     = $clientID
    Client_Secret = $clientSecret
    Username      = $Username
    Password      = $Password
    Scope         = "https://graph.microsoft.com/.default"
} 

$TokenResponse = Invoke-RestMethod -Uri "https://login.microsoftonline.com/$tenantName/oauth2/v2.0/token" -Method POST -Body $ReqTokenBody

$apiUrl = 'https://graph.microsoft.com/beta/me/presence'
$Data = Invoke-RestMethod -Headers @{Authorization = "Bearer $($TokenResponse.access_token)"} -Uri $apiUrl -Method Get

$Data.activity
$Data.availability