How to limit the number of device sign-ins for users in Azure AD?

Step 1: Sign into https://portal.azure.com or http://portal.office.com/ and click on Admin.

Step 2: Navigate to Azure Active Directory.

Step 3: In the Azure Active Directory admin center, click on Azure Active Directory on the left pane.

Step 4: Scroll down and click on Devices and go to Device settings.

Step 5: In the Maximum number of device per user area, enter the limit.