Azure Functions - In Powershell

Compulinx 

Your "profile.ps1" and "requirements.psd1" are looking fine to load the "Microsoft.Graph.Authentication" & "Microsoft.Graph.Users" modules and authenticate using the "System Managed Identity".

By default the Azure Function "System Managed Identity" is connecting to the https://management.azure.com scope.

The "Connect-MgGraph" command requires a token from the https://graph.microsoft.com scope .

Here's an example of an Azure  Function that is acquiring such a token for the "System Assigned Managed Identity" and authenticate:

(don't forget to give the correct permissions for the "System Assigned Managed Identity" on Azure Active Directory)

using namespace System.Net

# Input bindings are passed in via param block.
param($Request, $TriggerMetadata)

function Get-AzToken {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)]
        [String]
        $ResourceUri,
        [Switch]$AsHeader
    ) 
    $Context = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureRmProfileProvider]::Instance.Profile.DefaultContext
    $Token = [Microsoft.Azure.Commands.Common.Authentication.AzureSession]::Instance.AuthenticationFactory.Authenticate($context.Account, $context.Environment, $context.Tenant.Id.ToString(), $null, [Microsoft.Azure.Commands.Common.Authentication.ShowDialog]::Never, $null, $ResourceUri).AccessToken
    if ($AsHeader) {
        return @{Headers = @{Authorization = "Bearer $Token" } }
    }
    return $Token
    
}

$Token = Get-AzToken -ResourceUri 'https://graph.microsoft.com/'
Connect-MgGraph -AccessToken $Token
$usersJson = (Get-MgUser -All | Format-List  ID, DisplayName, Mail, UserPrincipalName | convertto-json -depth 100 ) 

# Associate values to output bindings by calling 'Push-OutputBinding'.
Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
    StatusCode = [HttpStatusCode]::OK
    Body = $usersJson
})

For more information to acquire the token, look ar the Stack Overflow discussion over HERE.