Well, MS got connected and poked around and finally figured out why we didn't have mail flow from O365 to on-prem. Turned out to be a setting in the Outbound Connector the Hybrid wizard messed up. We've only been on this journey for about 2 months. Now to actually see how this whole thing works and work out the remaining kinks.
Most of the documentation, and the different wizards, BPAs, etc., say the Autodiscover record should be autodiscover.outlook.com, rather that autodiscover.unitedwaytriangle.org.
But the MS Connectivity Analyzer fails all the Autodiscover, Activesync and Sync tests.
I can change the Autodiscover record easily enough but I'm really tired of throwing things against the wall to see what sticks. Those of you running in Hybrid, what's yours set at?
Thanks!