Hi Am230089,
1. How to configure federation in Tenant and Skype for business on-premise.
a. In the SFB Server on-premise, you need to configure on-premise Edge service for federation with SFB online. You need to choose the type of the federation and add a new hosting provider for SFB online. Details you could refer to the following official document:
Configure federation with Skype for Business Online.
b. In the online environment, you need to
configure external communication.
2. Which ports are required for Federation.
To make the federation work well, I suggest you need to open the ports as the following blog/official document:
Simplified port requirements for Skype for Business Online and
Port summary - SIP, XMPP federation, and public instant messaging in Lync Server 2013, it is similar as the SFB Server 2015.
Best Regards,
Evan Jiang
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