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?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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
Vasil Michev (MVP)Commented:
AAD Sync is deprecated now, you should use Azure AD Connect:

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
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.

Experts-Exchange Cleanup Volunteer
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Office

From novice to tech pro — start learning today.