All remotes display "Waiting for remote Core" error with existing setup (ref#KW3VWS)

All the current installers/packages are from 2022 (not 2017). So I would suggest you delete the outdated package, grab a new one from https://roononnas.org and install that instead, Maybe this fixes your issue.

Note: Install instructions are provided on the website with the installer/package downloads and displayed during installation in the installation wizard. More information about NAS installations can be found here on the forum in QNAP/Synology NAS and the article below is an excellent source of information too:

A Roon on (Synology) NAS Primer