Ok, so I tried several things and finally got it to work. (I tried logging out of icloud, trying a new local user, manually calling it from terminal - none worked).
Then I finally got it to work, and I think the final issue it was having was I didn't Authorized my account to play iTunes DRM'd movies (which some are downloads under DRM). This is more than just logging in, you have to go to the TV app, then under Account menu bar item, select Authorizations, and then Authorized this computer....
After that it allowed me to finally turn on Home Sharing and when it prompted for my info, after I gave the correct username and password, it took about 5 seconds and then it alerted me that it had started. It also took my AppleTV clients about 60 seconds when first connecting to get the list of my media (but I have a lot of videos and it may be faster for you).
Hope this helps someone else.... good luck everyone.