Not sure about the original sign up, Paul. To answer Johns query, both Spotify’s are downloaded apps. An interesting point which may give us a clue is that on the PC version of Spotify the Devices it looks for and finds are “This Computer” and 4 Echo Dots.
On my iPad Spotify it looks for and finds “This IPad”, the 4 Echo Dots, Sonos speakers in the Family room, Lounge and Kitchen, “Brennan” and “Air play or Bluetooth”.
The iPad device option appears on the PC when Spotify is opened up on the iPad.
Brennan device option only appears on the PC version of Spotify once it is “connected” to the iPad.
Are we getting any closer to a solution here?
What would happen if I didn’t have an iPad at all? Presumably I wouldn’t be able to use the Librespot facility at all.