I had create a public share link for my calender in Nextcloud in order to use it with MM. That’s an info I have not found anywhere. My config looks like this:
{
module: "calendar",
header: "Upcoming Birthdays",
position: "top_left",
config: {
timeFormat: 'absolute',
urgency: 0,
getRelative: 0,
showEnd: false,
dateFormat: 'Do MMM',
fullDayEventDateFormat: 'Do MMM',
calendars: [
{
symbol: "calendar",
url: "https://User:Password@your_url/remote.php/dav/public-calendars/xxxxxxxxxxxxx?export",
},
],
titleReplace: {
"Upcoming Birthdays": "",
},
This is finally working for me after trying all possible URL methods before.