mlb.tv -- post season
Due to Major League Baseball exclusivity, eligible MLB.TV subscribers in the U.S. must authenticate through their supported Pay TV provider. A one-time authentication is required. Check your Pay TV provider availability. Postseason games broadcast by ESPN, TBS, FOX and FS1 are available with authentication.
I followed this direction to do this --- I selected Spectrum as my tv provider and it set me over to the spectrum sign on screen --- I specified my id and password and got an error message that tried this to many times and to wait 30 minutes --- has any one else had this issue