O365 and onsite AD password Sync

We have onsite AD with usernames "user@location.company.corp".  The Office 365 user is "user@company.com"

I have found info that leads me to believe I need to do one of two things to make this work.

A) Add a UPN suffix for company.com to the local AD and change the users I want to sync to use the alternate UPN suffix.  


B) Verify the local domain (@location.company.corp) in Office 365.

As I have no experience with the AD connect tool, I was hoping some one could point me in the right direction.  Which one of the above should I use to make the password sync work?

Are there any other items I need to consider to make this sync problem free the first time?

Thanks experts!!!
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Aaron TomoskySD-WAN SimplifiedCommented:
Change your upn to the email address, super easy with PowerShell.
Cliff GaliherCommented:
Either option will get you there. But if you don't own location.company.corp (or company.corp) with a public registrar then you won't really be able to prove ownership with O365, taking option 2 off the table.
Aaron TomoskySD-WAN SimplifiedCommented:
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