Azure Administrator > Identities > Azure AD Connect (103)

✔ some prerequisites

make sure that your username suffix for your on-premises users has been added as a custom domain in Azure AD (ex. contoso.com)

how many objects you need to syncronize (limited by Azure AD tiers)

use IdFix tool to repair any potential problem areas like errors and illegal characters in mail addresses of user principal names

install on Windows Server Standard or higher with graphical user interface

download: https://github.com/microsoft/idfix

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