As far as I can work out it does not support embedded calendars only the “main” so my workaround is to show the individual calendars ie:

config: {
						colored:true,
						dateFormat: "MMM Do hh:mm",
						timeFormat: "absolute",
						showEnd: false,
						calendars: [
				           {
				             color: "#66f795",
							 symbol: "american-sign-language-interpreting",
						     url: "https://calendar.google.com/calendar/ical/......./basic.ics"    
		                   },
						   {
				             color: "#6683f7",
							 symbol: "birthday-cake",
						     url: "https://calendar.google.com/calendar/ical/...../basic.ics",    
		                   },
                           {
				             color: "#ffffff",
							 symbol: "calendar-check-o ",
						     url: "https://calendar.google.com/calendar/ical/...../basic.ics",    
		                   }						   
				                    ]
			        }
		},
}