getM365AppUSerDetail.ps1

Function AuthN {
    <#
    .SYNOPSIS
Authenticate to Azure AD and receieve Access and Refresh Tokens.

.DESCRIPTION
Authenticate to Azure AD and receieve Access and Refresh Tokens.

.PARAMETER tenantID
(required) Azure AD TenantID.

.PARAMETER credential
(required) ClientID and ClientSecret of the Azure AD registered application with the necessary permissions.

.EXAMPLE
$myCred = Get-Credential
AuthN -credential $myCred -tenantID '74ea519d-9792-4aa9-86d9-abcdefgaaa' 

.LINK
http://darrenjrobinson.com/

    #>
    [cmdletbinding()]
    param(
        [Parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [string]$tenantID,
        [Parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [System.Management.Automation.PSCredential]$credential
    )

    if (!(get-command Get-MsalToken)) {
        Install-Module -name MSAL.PS -Force -AcceptLicense
    }

    try {
        # Authenticate and Get Tokens
        $token = Get-MsalToken -ClientId $credential.UserName -ClientSecret $credential.Password -TenantId $tenantID  
        return $token 
    }
    catch {
        $_
    }
}

Function GetM365UserActivity {
    <#
    .SYNOPSIS
Get M365 User Activity.

.DESCRIPTION
Get M365 User Activity.

.PARAMETER days
(optional - Defaults to 7 Days) Days to report on.  Accepted values are 7, 30, 90, and 180

.EXAMPLE
GetM365UserActivity 

.EXAMPLE
GetM365UserActivity -days 30

.LINK
http://darrenjrobinson.com/

    #>
    [cmdletbinding()]
    param(
        [Parameter(Mandatory = $false, ValueFromPipeline = $true)]
        [ValidateSet("7", "30", "90", "180")]
        [string]$days 
    )

    # Refresh Access Token
    $global:myToken = AuthN -credential $myCred -tenantID $myTenantId

    try {
        if ($days) {
            # Get M365 User Activity
            $m365Activity = Invoke-RestMethod -Headers @{Authorization = "Bearer $($myToken.AccessToken)" } `
                -Uri  "https://graph.microsoft.com/v1.0/reports/getM365AppUserDetail(period='D$($days)')?$format=application/json" `
                -Method Get
        }
        else {
            # Get M365 User Activity
            $m365Activity = Invoke-RestMethod -Headers @{Authorization = "Bearer $($myToken.AccessToken)" } `
                -Uri  "https://graph.microsoft.com/v1.0/reports/getM365AppUserDetail(period='D7')?$format=application/json" `
                -Method Get
        }
        return $m365Activity
    }
    catch {
        $_
    }
}


# Globals
# Tenant ID
$global:myTenantId = 'tenantID'
# Registered AAD App ID and Secret
$global:myCred = [pscredential]::new("app/client ID", ("app secret" | ConvertTo-SecureString -AsPlainText -Force))
# Report Days
$reportDays = 90

<#
 
 M365 User Activity
 
 #>

Import-Module ImportExcel
Import-Module MSAL.PS 
$m365UserActivityData = GetM365UserActivity -days $reportDays
# $m365UserActivityData = $m365UserActivityData.replace("", "")

$m365UserActivityConverted = $m365UserActivityData | convertfrom-csv 
"Report Data for $($m365UserActivityConverted.Count) Users retrieved...."

$m365UserActivityConverted | Export-Excel -path "./M365UserUsageReport-$($reportDays)Days.xlsx" -AutoSize -AutoFilter -WorksheetName M365UserUsage -ConditionalText $(
    New-ConditionalText 'No' DarkRed LightPink
    New-ConditionalText 'Yes' DarkGreen LightGreen
)