azureblog.co.uk
← cd ~/graph-permissions
// graph-permissions · TeamsTelephoneNumber

TeamsTelephoneNumber.Read.AllMicrosoft Graph permission · Medium risk

Allows the app to read your tenant's acquired telephone number details, without a signed-in user. Acquired telephone numbers may include attributes related to assigned object, emergency location, network site, etc.

Application permission

Medium risk

Read Tenant-Acquired Telephone Number Details. Allows the app to read your tenant's acquired telephone number details, without a signed-in user. Acquired telephone numbers may include attributes related to assigned object, emergency location, network site, etc.

ID39b17d18-680c-41f4-b9c2-5f30629e7cb6
ConsentAlways needs admin consent
RiskReads data across the tenant without a signed-in user.

Delegated permission

Low risk

Read Tenant-Acquired Telephone Number Details. Allows the app to read your tenant's acquired telephone number details on behalf of the signed-in admin user. Acquired telephone numbers may include attributes related to assigned object, emergency location, network site, etc.

ID1bc6eab1-058d-4557-b011-d4c41cec88b7
ConsentNeeds admin consent
RiskRead access, limited to what the signed-in user can see.

Grant it to an app

In the portal: App registrations › your app › API permissions › Add a permission › Microsoft Graph › Application permissions, then grant admin consent. Or with Graph PowerShell:

powershell5 lines
Connect-MgGraph -Scopes "Application.Read.All", "AppRoleAssignment.ReadWrite.All"
$graph = Get-MgServicePrincipal -Filter "appId eq '00000003-0000-0000-c000-000000000000'"
$app   = Get-MgServicePrincipal -Filter "appId eq '<your app's client id>'"
New-MgServicePrincipalAppRoleAssignment -ServicePrincipalId $app.Id `
    -PrincipalId $app.Id -ResourceId $graph.Id -AppRoleId "39b17d18-680c-41f4-b9c2-5f30629e7cb6"

Ask for it when signing in

Delegated permissions act as the signed-in user, so the app can never do more than that user can.

powershell1 line
Connect-MgGraph -Scopes "TeamsTelephoneNumber.Read.All"

Which apps already have it?

powershell6 lines
# Apps that hold TeamsTelephoneNumber.Read.All as an application permission
Connect-MgGraph -Scopes "Application.Read.All"
$graph = Get-MgServicePrincipal -Filter "appId eq '00000003-0000-0000-c000-000000000000'"
Get-MgServicePrincipalAppRoleAssignedTo -ServicePrincipalId $graph.Id -All |
    Where-Object AppRoleId -eq "39b17d18-680c-41f4-b9c2-5f30629e7cb6" |
    Select-Object PrincipalDisplayName, PrincipalId, CreatedDateTime
powershell6 lines
# Apps with delegated consent for TeamsTelephoneNumber.Read.All
Connect-MgGraph -Scopes "Application.Read.All", "Directory.Read.All"
$graph = Get-MgServicePrincipal -Filter "appId eq '00000003-0000-0000-c000-000000000000'"
Get-MgOauth2PermissionGrant -All |
    Where-Object { $_.ResourceId -eq $graph.Id -and ($_.Scope -split " ") -contains "TeamsTelephoneNumber.Read.All" } |
    Select-Object ClientId, ConsentType, PrincipalId

Other TeamsTelephoneNumber permissions

Check every app in your tenant → Permission explainer

Sources