Have you used
I have never used it but my understanding is
spotifyd is not a gui application it is a daemon that runs in the background and you use another device on your network to cast to your PC. Alternatively you can use
spotify-qt as a front end to it, there are other frontends but they are not available on Solus.
spotifyd will not appear in your system menu (it has no .desktop file), only
spotify-qt would and either way requires editing config files to function.
I have spotify premium so I will try look at updating it later since the maintainer does not appear to be around any more (last activity in 2021).