GNU/Linux Ubuntu 20.04 Spotify AirPlay – Step by step Guide
How to Spotify AirPlay on Ubuntu 20.04 Focal LTS GNU/Linux – Step by step Tutorial.
And to Setup Apple AirPlay on Ubuntu 20.04 we make use of the PulseAudio Module RAOP.
Finally, the Apple AirTunes Sound Devices are make discoverable using the PulseAudio Paprefs UI Tool.

How to Spotify AirPlay on Ubuntu 20.04 Focal LTS GNU/Linux