By default Microsoft 365 conceals user names in activity reports, replacing UPNs with anonymous IDs. This prevents the assessment from showing per-user consumption data (Teams, Exchange, OneDrive…). You must turn it off.
# Requires Microsoft.Graph module and Global Admin or Reports Admin role
Connect-MgGraph -Scopes "ReportSettings.ReadWrite.All"
Update-MgAdminReportSetting -DisplayConcealedNames $false
Write-Host "Done — per-user report data is now visible."
After creating the app registration, copy the Application (client) ID from the Azure portal and paste it here. The directory (tenant) ID is pre-filled by your administrator and cannot be changed.