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How to Block Sign-In for a User in Microsoft 365

· 9 min read
Jagdish Kumawat
Founder @ Dewiride

When someone leaves, the first thing to do with their account is stop it being used. Block sign-in does exactly that: nobody can sign in as the person, and their mailbox, files and data stay where they are. This guide blocks a leaver in the Microsoft 365 admin center, shows what he sees when he tries to sign in, and does the same with PowerShell.