Connecting local domain with Office 365 (split domain) in order to synch users and have SSO

Connecting local domain with azure connect and Office 365 (split domain)
Hi have a windows 2012 r2 domain controller with local domain "" ; now customer subscribed offie 365 in order to manage thei mailbox but domain is "".
My gol is synch users and have SSO between local domain and office 365 tenant
Which is a secure and affordable way to realize this synch?
Thanks, ask me for details
Mattia MinerviniAsked:
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- Set up adfs OR AAD password sync (easier)

- Add to the tenant domains ( you'll be given info to setup dns / domain validation)

- switch MXes to the o365 ones
Mattia MinerviniAuthor Commented:
ok, first step wit AAD is more complex, i think.
my local use are on domain , but on tenant i will have
what happens to local user profile on pc?
which properties i have to modify on user properties? UPN? is not reachable on internet....
AD domain is different from mail domain.
Local user profile is not involved.
You have to setup AAD connect to sync properties between the Tenant and your AD, find a guide

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Mattia MinerviniAuthor Commented:
solved, now i'm working with local domain user in synch with azure ad connect
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