@Anonymous Welcome to Microsoft Q & A Community Forum. Kindly ensure to register the preview feature in your Azure subscription by following these steps:
- Sign in to the Azure portal.
- In search, enter and select Subscriptions.
- In Subscriptions home page, select your subscription from the list.
- In the Subscription | Preview features page, under Settings, select Preview features.
- Search for Dynamic scoping.
- Select Register and then select OK to get started with Dynamic scope (preview).