MLB app authentication for St. Louis Cardinals, Atlanta Braves, and Cincinnati Reds on Xfinity

What is the status of the MLB Xfinity authentication for accessing your local team's broadcast through the mlb app when not on your home wifi network?

cardinals.tv, braves.tv, and reds.tv are a few of the teams that still don't have Xfinity authentication available. Yet if you go to the twins authentication landing page you will find an Xfinity authentication that was setup last year when they took over their own broadcasts.