If your syndicated listings are missing on Brevitas you will need to log in to your Buildout account to fix this problem.
Log in to your Buildout account
Hover over the listing that is missing from Brevitas and click the edit button
Now click the checkbox at the top of the setting page "connect syndication"
4. Once this is done make sure Brevitas is a connected channel, by going to your profile page and click on the syndication tab on the left hand side of the screen.