CMG Setup – Subscription ID drop down not populating | SCCM | ConfigMgr

When setting up a Cloud Management Gateway (CMG) in SCCM/Configuration Manager, you may encounter an issue where the Subscription ID drop‑down list remains blank even after a successful Azure sign‑in. While the dialog correctly displays the Azure AD app and tenant names, the Subscription ID field shows a red exclamation mark and fails to populate. This problem is typically caused by missing Azure subscription owner permissions, even if the user has Global Administrator rights. In this guide, we’ll explain the cause, show how to verify permissions, and provide the steps to resolve the issue.

Symptoms – Subscription ID Drop‑Down Blank in SCCM CMG Setup

When configuring the Cloud Management Gateway (CMG) in SCCM/Configuration Manager, the Subscription ID drop‑down list remains blank even after a successful Azure sign‑in. The setup wizard correctly displays the Azure AD app and tenant names, but the Subscription ID field stays empty and shows a red exclamation mark.

This issue can occur even if the user has Global Administrator permissions in the Microsoft Azure tenant, highlighting that Global Admin rights alone are not sufficient for CMG setup.

Root Cause – Missing Azure Subscription Owner Permission

To make changes to an Azure subscription, the user must have Subscription Owner permissions. In this scenario, although the user had Global Administrator rights, the Subscription Owner role was not assigned, which prevented the CMG setup from completing successfully.

Solution – Assign Azure Subscription Owner Role

The user must be assigned Azure Subscription Owner permissions to make changes at the subscription level. An existing administrator can grant the Owner role (an Azure RBAC role) at the subscription scope. For detailed steps, refer to the official Microsoft documentation on assigning the Subscription Owner role.

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