Tenant Federation with hybrid/on-premise mailboxes

[Jason Gaffney]

Hello,

I am trying to federate two O365 Tenants. Tenant 'A' is completely cloud based, Tenant 'B' is currently in a hybrid configuration with mailboxes on-premise.

Free busy is working one way, as I can view Free/Busy in tenant 'A' from tenant 'B'.

It is not working when viewing mailboxes that reside on premise in tenant 'B', from tenant 'A'.

Is this a supported scenario?

Or is there any documentation on how to configure and or troubleshoot?

Thank you.

[#2]

Hi Jason,

You have to federate the free busy from Tenant A to Hybrid EWS Server (on-premises) of Tenant B.

If you want to view On-premises free/busy you will need to point to the on-premises infrastructure.

[#3]

Read here: https://blogs.msdn.microsoft.com/mvpawardprogram/2014/01/27/calendar-federation-with-an-exchange-hyb...