An Azure service that provides fine-grained access management for Azure resources, enabling you to grant users only the rights they need to perform their jobs.
Hello Joy Xu,
Since there is no Owner or User Access Administrator assigned on the subscription, roles cannot be assigned directly.
Please reach out to your Microsoft Entra ID Global Administrator and request them to temporarily elevate access using Access management for Azure resources. This will grant them User Access Administrator permissions, after which they can assign the required subscription role to the appropriate user.
Once the role assignment is completed, the elevated access should be removed.
Elevate access to manage all Azure subscriptions and management groups | Microsoft Learn
Note for Microsoft internal employees: You generally do not need to contact another Global Administrator. Instead, you can request the access elevation through the ISRT form.