Sonos Doesn't discover the spot. Your not describing what you want to do.
IN the Alexa app you can see the Sonos One and the Spot. Both have alexa built in.
IN the Sonos app you will see the Sonos One as a zone. You will not see the spot as the spot is not a Sonos unit.
Respect the Queue (2)Move (3)Beam (1) Era100 (2)ARC (1)SonosOne (1)Playbar (4)Play5 (4)Play1 (3)Play3 (1)Port (2)Connect (1) Roam (2) Ace (1)Connect:Amp (4)Sonos Amp (1)Sub + (9) Echo + Smartthings; (2)Play)