Sync Local AD and office 365 users

I have a client who already has an office 365 account with existing users setup. They also have a local AD on premise. I need to link the two together so that when they change their user password it will sync with their user on office 365 for exchange.  The on premise AD is a .local and the office 365 is the actual domain .com. Any help is greatly appreciated.
Who is Participating?
Vasil Michev (MVP)Commented:
AAD Sync is deprecated now, you should use Azure AD Connect:
yo_beeDirector of Information TechnologyCommented:
You need to use Azure Active Directory Sync.

There are a few things that you need to do to get this to work properly.  The first thing is to and an secondary UPN that matches your public domain name.
Here is the how to that you should follow.
This might be better link for you
yo_beeDirector of Information TechnologyCommented:
Thank you for the correction.
PberSolutions ArchitectCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

-- Vasil Michev (MVP) (https:#a42421020)
-- yo_bee (https:#a42420776)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

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