Merge Local AD with Azure AD - Best practise for the case below

[hoffcm]

Hi Guys,

we have a client that has the following setup:
- Local AD with different users (1 Domain)

- Office 365 Azure AD with different users, some are the same as in the Local AD (4 Domains)

What would be the best practice to merge those two / match the users. 

Many thanks
Andre

[#2]

I would use DirSync. You can configure how to sync your On-Prem with Azure AD.

[#3]

Azure AD Connect sync will match local and Azure AD users based on primary SMTP and soft match based on UPN. If the local and remote identity have the same SMTP or UPN, they will be merged.
https://docs.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-syncservice-features?W...