Grant API permissions

Managed identity

We need to grant API permissions to the service principal object in Azure. For a managed identity, this can only be done with PowerShell at the time of writing.

Run the following PowerShell code to grant API permissions. It requires the AzureAD PowerShell module and Global administrator permissions.

Set the following variables in the script:

• TenantID. This is the tenant ID for your tenant.

• GraphAppId. You do not need to change this.

• DisplayNameofMSI. The display name of your managed identity, which is the same as the name of your automation account.

• Permissions. Here you can list which permissions you want to grant. You can reference the MS Docs to find the permissions you need. In this example, I have granted some Intune device management permissions ('DeviceManagement*') as well as some other Azure AD permissions. The permissions you assign here determine what data you can access in Microsoft Graph and you can run this again later to add additional permissions if required.

Note these are application permissions not delegated permissions

$TenantID="a84894e7-1234-5678-abcd-320d0334b399"
$GraphAppId = "00000003-0000-0000-c000-000000000000"
$DisplayNameOfMSI="<name of managed identity" 
$Permissions = @(
    'DeviceManagementManagedDevices.Read.All'
    'Device.Read.All'
    'WindowsUpdates.ReadWrite.All'
    'DeviceManagementServiceConfig.Read.All'
    'Directory.Read.All'
    'DeviceManagementConfiguration.Read.All'
    'Organization.Read.All'
    'DeviceManagementApps.Read.All'
)
# Install the module (You need admin on the machine)
Install-Module AzureAD 

Connect-AzureAD -TenantId $TenantID 
$MSI = (Get-AzureADServicePrincipal -Filter "displayName eq '$DisplayNameOfMSI'")
$GraphServicePrincipal = Get-AzureADServicePrincipal -Filter "appId eq '$GraphAppId'"
foreach ($Permission in $Permissions)
{
    $AppRole = $GraphServicePrincipal.AppRoles | 
        Where-Object {$_.Value -eq $Permission -and $_.AllowedMemberTypes -contains "Application"}
    New-AzureAdServiceAppRoleAssignment -ObjectId $MSI.ObjectId -PrincipalId $MSI.ObjectId -ResourceId $GraphServicePrincipal.ObjectId -Id $AppRole.Id
}

Once granted, you will find these permissions listed against the Enterprise application for your managed identity in the Permissions pane.