Roonserver running on Synology NAS will not open on pc and phone

Well there is your answer; installing the raw Linux binary on your Synology won’t work. You need to use the .spk (Synology PacKage) file for Roon on NAS here:

https://roononnas.org/en/synology-dsm7/

You will then also need these packages if you have any .m4a (AAC) format music:

https://johnvansickle.com/ffmpeg/

Basic guidance for installing that is in the first post on A Roon on (Synology) NAS Primer

That is the only official way to run Roon on your Synology. Please remove all other installations before doing so.