directorySizeQuota not updated on new Business Premium tenant - cannot register apps

remium license assigned and a verified custom domain. The "Users can register applications" setting is enabled. The tenant has approximately 490 users and 137 service principals and no deleted objects.

When attempting to register any application I receive the error: "Failed to create BitTitan application. Error detail: The directory object quota limit for the Tenant has been exceeded. Please ask your administrator to increase the quota limit or delete objects to reduce the used quota. "

I believe the tenant's directorySizeQuota has not been updated to the 300,000 object limit expected for a verified-domain Business Premium tenant. I have confirmed this via PowerShell using Get-MgOrganization.

Microsoft 365 support (2603060010002144) directed me to Azure support. Azure support only allows billing tickets without a paid support plan. The paid support plan path gets me an unresponsive web page every time. I am unable to find any other route to get this resolved.

Can anyone advise, or help escalate to the Entra backend team to recalculate this tenant's quota?