Alexa not playing Spotify ‘Song radio’

[Ilonak]

When using the Spotify app, when I select a song to play, Spotify will play other similar songs (chosen automatically) afterwards. It’s called ‘Song radio’. 

I love this feature. I have an Alexa-enabled Sonos speaker and would like Spotify to play other similar songs after it’s finished playing the song I requested from Alexa by voice command. However, what happens instead is that after it’s played the song I’ve requested, it stops dead. 

Is there any way to enable ‘Song radio’ by voice command on Alexa?

Plan

Premium

Country

UK

Device

Sonos One with Alexa

[XXPepper]

Just figured it [or a way] out.
Say, "Alexa play Spotify radio [song name [by artist]]"

Apparently the syntax matters.