IcalCalender and Calendar in Synology NAS

Hi All, I would like to use the calendar from my Synology NAS (DS220+) in the IcalCalender app.
I would like to send events to my Ulanzi digital Clock. The link that Synology provides doesn’t work in the IcalCalender app. Error: request failed with status code 401

Does anyone know if is possible to use the Synology Calendar in IcalCalender?
Thanks for the answer!

Why not ask this question in app thread?

Please use search and ask in the appropriate topic, as linked in the App store or use the search to centralize questions about a specific App of device/brand.

Like fe [APP][Pro] IcalCalendar

Therefore Closed.