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.  

https://support.office.com/en-us/article/How-to-prepare-a-non-routable-domain-such-as-local-domain-for-directory-synchronization-e7968303-c234-46c4-b8b0-b5c93c6d57a7?ui=en-US&rs=en-US&ad=US#bk_register

Or
B) Verify the local domain (@location.company.corp) in Office 365.
https://docs.microsoft.com/en-us/azure/active-directory/add-custom-domain

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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IKtechAsked:
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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.
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Aaron TomoskySD-WAN SimplifiedCommented:
Change your upn to the email address, super easy with PowerShell.
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Aaron TomoskySD-WAN SimplifiedCommented:
Cleanup
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