Webdav troubleshooting: OSX to NextCloudPi

NCP Webdav functionality was verified from an Ubuntu device. From the OSX command line terminal: mount_webdav -i https://fqdn.duckdns.org/remote.php/webdav/ /Users/user/ncp points to a nextcloudPi server and did not return anything (except a prompt for the username + password). Test 1: ls /Users/user/ncp returned nothing. Test 2: mount | grep Users/user/ncp returned nothing. Questions: 1. Where to begin troubleshooting? 2. What does success look like upon issuing the mount_webdav command? 3. Should test 2 be expected to return anything? Any diagnostic test questions are appreciated.