Dec 18 2020 03:32 PM - edited Dec 18 2020 03:33 PM
Dec 19 2020 03:25 AM
@Marvin Oco
Hey,
The .onmicrosoft address is an online attribut, and is not really related to any attribute in the on-prem Active Directory.
If you really need to change it, you need to stop Azure-AD Connect and make sure that the user object is "in-Cloud", edit the alias and then re-enable Azure-AD Connect.