This shows how to setup the NAS to synchronize your contacts list with outlook, your phone, or any other device that respects the cardDAV interface hosted by the NAS.
Login at the https://stovallhut.online/ desktop and launch the Synology Contacts application from there. This let's you review and edit the contacts database where it "lives".
In outlook connect to the carddav server URL as shown in the Synology Contacts package on DSM. This goes under the CalDav Synchronizer options in Outlook.
On the iPhone go to Settings -> Contacts -> Accounts...Add Account...Other...Add CardDAV Account. Fill in server name as stovallhut.online and then user name and password for your login at the stovallhut.online desktop.