Hi TB303,
Based on my experience, there is no log to check the domain name of your federation company, you need to confirm the name with your federation domain.
Moreover, I will share a document about how to do SFB federation, please refer to
https://technet.microsoft.com/en-us/library/jj204800%28v=ocs.15%29.aspx
Note: It’s same to SFB server 2015.
Hope this reply is helpful to you.
Regards,
Alice Wang
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