Shared calendars ICS format available - calendar - Nextcloud community
▻https://help.nextcloud.com/t/shared-calendars-ics-format-available/8688
I have found a solution for this. You have to put ?export to the end of the WebdDAV link like here:
▻https://SERVER/remote.php/dav/public-calendars/AD7AAHA17NA11AEA?export