Assign a user as an administrator of an Azure subscription
To make a user an administrator of an Azure subscription, assign them the Owner role at the subscription scope. The Owner role gives the user full access to all resources in the subscription, including the permission to grant access to others. These steps are the same as any other role assignment.
To assign Azure roles, you must have:
Microsoft.Authorization/roleAssignments/writepermissions, such as User Access Administrator or Owner
Step 1: Open the subscription
Sign in to the Azure portal.
In the Search box at the top, search for subscriptions.
Click the subscription you want to use.
The following shows an example subscription.
Step 2: Open the Add role assignment page
Access control (IAM) is the page that you typically use to assign roles to grant access to Azure resources. It's also known as identity and access management (IAM) and appears in several locations in the Azure portal.
Click Access control (IAM).
The following shows an example of the Access control (IAM) page for a subscription.
Click the Role assignments tab to view the role assignments at this scope.
Click Add > Add role assignment (Preview).
If you don't have permissions to assign roles, the Add role assignment option will be disabled.
The Add role assignment page opens.
Step 3: Select the Owner role
The Owner role grant full access to manage all resources, including the ability to assign roles in Azure RBAC. You should have a maximum of 3 subscription owners to reduce the potential for breach by a compromised owner.
On the Roles tab, select the Owner role.
You can search for a role by name or by description. You can also filter roles by type and category.
Step 4: Select who needs access
On the Members tab, select User, group, or service principal.
Click Select members.
Find and select the user.
You can type in the Select box to search the directory for display name or email address.
Click Save to add the user to the Members list.
In the Description box enter an optional description for this role assignment.
Later you can show this description in the role assignments list.
Step 5: Assign role
On the Review + assign tab, review the role assignment settings.
Click Review + assign to assign the role.
After a few moments, the user is assigned the Owner role for the subscription.