Yesterday I tried to have on-premises AD take over my Azure AD user, by create a same user on local AD, use the same UserPrincipalName and ProxyAddress, and it worked.
Today, I tried this on a brand new Windows Server, it failed several times. I got the email saying: The object has been updated in your Azure Active Directory, but with some modified properties, because the following attributes are associated with another object..
I want to know why is that happened, and I want it's working.. Thanks in advance.