In this blog post, I will show you how to view who login activities in your Microsoft Azure tenant and when.
Sign-ins logs
Out of the box and for free, Microsoft Azure offers 30 days history of all login activities to Microsoft Azure portal.
Check Sign-ins
To access the click on The Azure Active Directory icon located in the Azure portal.

From Azure Active Directory, Monitoring section located on the left navigation menu click on Sign-ins.

From the sign-in page, you will see all the sign-ins \ login activities with Date, Username, IP address and Location.

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