Forum Discussion
Retrive programmatically SharePoint Online storage space
How can I retrieve programmatically SharePoint Online allocated (purchased) storage space of the whole tenant, which is visualized "In the upper right of the page": https://docs.microsoft.com/en-us...
You could try to use the PowerShell Get-SPOSite with the --StorageUsageCurrent parameter.
Run it for all sites and calculate the total.
Not sure if this would work in your case.
https://docs.microsoft.com/en-us/powershell/module/sharepoint-online/get-sposite?view=sharepoint-ps