What is the Caldav link for the birthday calendar?

Using /e/OS Applications
1

The birthdays from the address book didn’t sync anymore with the calendar app. In the process of solving the issue I deleted the birthday calendar. Now I want to add it again; what is the caldav link?

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2

should be this one - edit the “yourusername”

https://murena.io/remote.php/dav/calendars/yourusername/contact_birthdays/
3

Thanks a lot for the info! Unfortunately, when I try to add a Caldav calendar to the Calendar app, I get the message ‘failed to fetch app details’, so I cannot test if it works.
EDIT: I now installed DAVx5 and managed to add the CalDAV account to the Calendar app, but now all my appointments in the calendar are doubled and I still don’t have the birthdays.