Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello
The recent change is about the nonprofit grant, meaning, as nonprofit, you no longer get the 10 Microsoft 365 premium licenses for free. You will still get the Microsoft 365 business basic license for free, up to 300 licenses.
Your account should still exist and nonprofit pricing is still available.
Sign into https://admin.microsoft.com as the organization's admin user to manage your account and users. If your users are still on the premium licenses, you need to either pay for them now, or switch them to the basic license. You can also pay for the Microsoft 365 Business Standard, the nonprofit rate for that one is very reasonable.