Thanks for posting your question in the Microsoft Q&A forum.
Microsoft often provides certain services and licenses to eligible non-profit organizations at no cost. The Entra ID P1 (formerly Azure AD P1) license you're seeing is likely part of this grant.
Entra ID is separate from an Azure subscription. You can have Entra ID licenses without an active Azure subscription for cloud services.
Ensure that your organization has been properly registered and verified as a non-profit with Microsoft. This can usually be done through the Microsoft Non-profit Portal
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