Office 365 tenants using Azure AD external identities (like Azure B2B Collaboration guest accounts with apps like Teams) are moving to a monthly active users (MAU) billing model. The new model replaces the 1;5 ratio for Azure AD premium licenses used up to now. Microsoft allows tenants to have the first 50,000 unique external identities free of charge each month and bills for access thereafter. If you don’t already have an Azure subscription, you’ll need one to link to Azure AD. Linking the subscription should be an easy task, until it’s not…
https://office365itpros.com/2021/11/04/azure-ad-mau-billing-external-identities/
