To get the users' AD profile over to the Azure user's roaming profile, you can use the Azure AD Connect tool. Azure AD Connect is a synchronization tool that synchronizes user accounts, passwords, and other attributes between on-premises Active Directory and Azure AD.
To synchronize the user profile using Azure AD Connect, you will need to follow these steps:
1. Install Azure AD Connect on your on-premises domain controller.
2. Run the Azure AD Connect wizard and select the option to synchronize the user profiles. During the wizard, you can also choose which attributes to synchronize.
3. Once the synchronization is complete, the user's profile should be available on both the on-premises Active Directory and Azure AD.
However, it's important to note that this method will only synchronize the user's profile attributes such as their personal settings and files. It will not synchronize any installed applications or customizations specific to the user's old PC. For that, you may need to use one of the other options I mentioned earlier, such as Windows Autopilot or a third-party tool like FSLogix.