How?

[Rens93]

I've done the few steps in the description, but there is no button in HomeKit..
Is there something I have to do before I see Spotify in HomeKit ?

[JSRossiter]

did you restart homebridge?
I use launchctl unload ~/Library/LaunchAgents/com.homebridge.server.plist and launchctl load ~/Library/LaunchAgents/com.homebridge.server.plist although you might have a different setup

[Rens93]

You're my hero! launchctl load ~/Library/LaunchAgents/com.homebridge.server.plist worked for me..
Solved!