Checking the details of the Azure subscription I had linked to Azure AD revealed that some unexpected costs were clocking up for premium Azure AD features. Microsoft promises that the first 50,000 unique guest user accesses are free each month, so why were those charges growing. It’s all down to how the Microsoft eCommerce system works, and everything is fine in the end.
https://office365itpros.com/2021/11/19/unexplained-azure-costs-azuread-guest-access/
