The correct option is Microsoft 365 Admin Center.

Microsoft 365 Admin Center is the console where administrators manage subscriptions, licensing, and support for Microsoft 365 services and applications. Activation problems for Microsoft 365 apps are usually related to licensing or tenant configuration so opening a support request from this admin center gives Microsoft the tenant context and the subscription details needed to troubleshoot and resolve the issue.

Microsoft Entra ID is focused on identity and access management such as users, groups, and authentication. It does not provide the subscription and support workflow used to resolve app activation or licensing problems.

Azure portal is used to manage Azure resources and Azure subscriptions. It is the right place to open support requests for Azure services but not for Microsoft 365 app activation which is handled through the Microsoft 365 admin experience.

Endpoint Manager admin center is intended for device and application management with Intune. It is appropriate for deploying and managing apps on devices but it is not the primary console for tenant licensing or Microsoft 365 activation support requests.

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