Add or change Azure subscription administrators …
To assign a user as an administrator Sign in to the Azure portal as the subscription owner and open Subscriptions. Click the subscription where you want to grant access. Click Access control (IAM).
https://docs.microsoft.com/en-us/azure/cost-management-billing/manage/add-change-subscription-administrator
Azure classic subscription administrators | Microsoft Docs
Sign in to the Azure portal as a Service Administrator or Co-Administrator. Open Subscriptions and select a subscription. Co-Administrators can only be assigned at the subscription scope. Click Access control (IAM).
https://docs.microsoft.com/en-us/azure/role-based-access-control/classic-administrators
Add or modify Azure administrator subscription roles …
Sign in to the Azure portal, select Subscription in the left pane, and then select the subscription that you want to rename. Select Access Control (Identity & Access Management), and then select Add.
https://docs.azure.cn/en-us/billing/billing-add-change-azure-subscription-administrator
How to delegate administration in Azure AD
In this session learn how to control access to Azure Active Directory using Azure AD administrative roles, including new capabilities like delegated application management and the role management UX in portal.azure.com. Also, get a sneak peek at the future roadmap for controlling access to Azure Active Directory.
https://azure.microsoft.com/de-de/resources/videos/ignite-2018-how-to-delegate-administration-in-azure-ad/
How to manage local administrators on Azure AD joined …
Sign in to your Azure portal as a global administrator. Search for and select Azure Active Directory. In the Manage section, click Devices. On the Devices page, click Device settings.
https://docs.microsoft.com/en-us/azure/active-directory/devices/assign-local-admin
Azure EA portal administration | Microsoft Docs
To add another enterprise administrator: Sign in to the Azure Enterprise portal. Go to Manage > Enrollment Detail. Select + Add Administrator at the top right.
https://docs.microsoft.com/en-us/azure/cost-management-billing/manage/ea-portal-administration
Quickstart: Add guest users in the Azure portal – Azure AD …
Sign in to the Azure portal as an Azure AD administrator. In the left pane, select Azure Active Directory. Under Manage, select Users. Select New guest user.
https://docs.microsoft.com/en-us/azure/active-directory/external-identities/b2b-quickstart-add-guest-users-portal
Step-by-Step Guide to Restrict Azure AD Administration portal
Log in to Azure portal as Global Administrator 2. Go to Azure Active Directory | User Settings 3.
Step-by-Step Guide to Restrict Azure AD Administration portal