MGM+ Live unavailable on Xfinity Stream

Title pretty much says it all.  I added MGM+ yesterday and am unable to access MGM+ live on any tv or XUMO box.  This makes no sense as I am allowed to view MGM live tv on my desktop when accessing the MGM+ site directly, despite signing up for MGM+ through Xfinity.  It clearly stated I would have access to all shows and movies and live programming on MGM+ through Xfinity Stream.