Teams with Exchange 2016 on-premise full classic hybrid (UPN and Email do not match)

[Tech10]

Hi,

Here is the scenario I am after:

-Exchange 2016 on the latest CU in hybrid with O365 (Classic Full hybrid)

-UPNs and Primary email addresses of users do not match (using the same routable domain for both)

-User mailboxes are hosted on-premises Exchange 2016 DB

-Hybrid is to license users on O365 and turn on Teams and migrate mailboxes at some time later

I think by default SIP address stamped will match the UPN.

Question:

Will the Teams integration with Exchange on-premise mailboxes work for calendar sharing with this scenario of UPN not matching the SMTP address? 

If the answer is no, will it help if we stamp a proxy address matching UPN without changing the primary SMTP address.

Thanks in advance!

[#2]

Simply put, change the UPN to match the email address. No matter how hard it is to do.
Otherwise you and your users will regret it forever.