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/sharepoint/manage-site-collection-storage-limits
In report below, it is possible to retrieve used storage space, but not the allocated.
https://docs.microsoft.com/en-us/graph/api/reportroot-getsharepointsiteusagestorage?view=graph-rest-beta
Oleksii_Kolinko I found the answer:
https://sharepointnomad.wordpress.com/2020/06/29/office-365-storage-utilization-alerts-with-a-power-automate-workflow/
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
