Created by Claude - please verify

Storage and quota risk - growth is a straight-line projection of the tenant's last 90 days, not a per-mailbox forecast.

Required Microsoft Graph permissions

Reports.Read.All — application permission, granted to the app registration with admin consent.

Endpoints: GET /v1.0/reports/getMailboxUsageDetail, getSharePointSiteUsageDetail, getOneDriveUsageAccountDetail (D30) · GET /v1.0/reports/getMailboxUsageStorage, getSharePointSiteUsageStorage, getOneDriveUsageStorage (D90)

Usage reports lag by up to 48 hours. If report names are concealed in the Microsoft 365 admin center, names and URLs show as hashes.

If a permission is missing, this report shows a red load error with the Graph status code — not an empty table.

Storage Growth & Quota Risk

Which mailboxes, SharePoint sites and OneDrives are close to their quota - a full mailbox stops sending mail, a full site stops accepting files - and how fast each workload is growing across the tenant.

The usage reports returned no mailboxes, sites or OneDrives. Please contact support if this is not the expected result.