Hi @Srinivas Pasupuleti - CyberSecurity
Thank you for post!
When you enable Hybrid Azure AD join in Microsoft Entra, devices that are already Azure AD registered and on-premises AD joined will not automatically convert to Hybrid Azure AD join you will need to manually unenroll these devices from Azure AD registered and then enable Entra hybrid join to convert them into Entra hybrid join devices.
Any existing Microsoft Entra registered state for a user would be automatically removed after the device is Microsoft Entra hybrid joined and the same user logs in.
For more readings https://learn.microsoft.com/en-us/entra/identity/devices/hybrid-join-plan#handling-devices-with-microsoft-entra-registered-state
https://learn.microsoft.com/en-us/entra/identity/devices/how-to-hybrid-join
https://learn.microsoft.com/en-us/entra/identity/devices/hybrid-join-control
Hope this helps. Do let us know if you any further queries.
Thanks,
Akhilesh.
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