Look at the FAQ:
https://www.microsoft.com/en-us/nonprofits/faq
Or support:
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Hello Team,
We wanted to ask a couple of questions related to the Microsoft program: Could you confirm the date of the year when the renewal of the Non-Profit program takes place? We would also like to know how we can calculate the costs if we want to increase the number of users. Specifically, what would be the price for each of the resources we currently have assigned if we want to add more users to our APK.
Thank you for your support, we look forward to your comments.
We would like to coordinate writing to someone who can help us with this information.
Best regards