I am also new to MM, but here are the fields that are missing on yours compared to mine. I am not sure which is required and which is optional.

                {
                        module: "MMM-CalendarExt2",
                        config: {
				rotateInterval: 1000*60,
                                calendars: [
                                            {
                                                        name: "PrivateCalendar",
							className: "privatecalendar",
                                                        url: "https://<usernam>:<password>@<hostname>/remote.php/dav/calendars/<username>/privatecalendar?export",
                                            },
                                ],
                                views: [
                                        {
                                                name: "VIEW1",
						mode: "daily",
                                                locale: "de-DE",
                                                position: "top_right",
                                                calendars: ["PrivateCalendar"],
						slotCount: 4,
                                        },
                                ],
                                scenes: [
                                        {
                                                name: "DEFAULT",
                                                views:["VIEW1"],
                                        },
                                ],
                        },
                },