Hello I am migrating from exchange 2013 to Exchange online and want to use Duo for federation with 365. I have a default domain of mydomain.com and i have the onmicrosoft domain. If I select the onmicrosoft domain as default I can then federate the mycompany.com domain but I can't change it back. I was wondering what are the issues if i leave onmicrosoft as the default? Can I just manually change the domain for any new user I create so they get the mycompany.com domain? Is that the ramification I will deal with in the future? Are there any other issues I need to worry about? thanks so much!