Copilot add-on availability and assignment are controlled by licensing and the Microsoft 365 admin, and must meet the supported license requirements.
From the provided information:
- To use Microsoft 365 Copilot in the desktop apps, the account must have:
- A qualifying base subscription (for business users: Microsoft 365 Business Basic, Business Standard, Business Premium, E3, E5, F1, or F3), and
- A Microsoft 365 Copilot license assigned on top of that.
- Admins must ensure that:
- The user is assigned a license that supports Microsoft 365 Copilot.
- Copilot is not blocked by organizational policies.
If the tenant or specific offer associated with the MCT E5 benefit does not allow purchase or assignment of the Microsoft 365 Copilot add-on, the only supported path is for the Microsoft 365 admin to:
- Verify that the tenant is eligible to purchase the Microsoft 365 Copilot add-on and that it appears as an available license in the Microsoft 365 admin center.
- Purchase the appropriate Copilot add-on (for example, Microsoft 365 Copilot or Microsoft 365 Copilot Business) in the tenant that hosts the E5 subscription.
- Assign the Copilot license to the E5 user account.
- Confirm Copilot is not blocked via privacy or policy controls and that the apps are on a supported update channel (Current Channel or Monthly Enterprise Channel for Windows clients).
If the Copilot add-on cannot be purchased or assigned in the MCT benefit tenant, this is a licensing/offer limitation and cannot be bypassed technically; the admin would need to work with Microsoft support or use a different commercial tenant that supports Copilot licensing.
Once a valid Copilot license is assigned and allowed by policy, Copilot should appear in the Microsoft 365 apps after license propagation and a license refresh in the apps.
References:
- Frequently asked questions about Copilot in Microsoft 365 subscriptions
- Copilot is missing, disabled, or doesn't work correctly
- How to find and enable missing Copilot button in Microsoft 365 apps
- Considerations for Microsoft 365 Copilot Chat admins
- Microsoft 365 Copilot Retrieval API errors with Authorization Failed - User does not have valid license - Microsoft Q&A