surround sound

First you need to make sure you have added the One SLs as surrounds.  Are they all listed as the same room? (Beam + LS +RS)  If not, see this link:

https://support.sonos.com/en-us/article/add-surround-speakers-to-a-sonos-home-theater

Hi. Ive added the two speakers separately but they are all in the same room. 

That’s grouping.  You need to follow the link I gave to add them as surrounds.  Otherwise they are just repeating what the Beam is playing, not surround sound.  Ungroup them and then add as surrounds so they are all in the same room.

Ok, thanks. I’ll give it a go!

I’ve done that but it’s as if the sound in now only coming from the beam in front. I’ve listened to the speakers and there’s sound but you don’t really hear it. 

If I adjust the volume from my phone it only adjusts the beam

It actually adjusts them all.  The Surrounds are now part of the room.  You can adjust the individual level in the Settings for the room. 

Unless I actually go up to the speaker, I can only hear sound from the beam in front of me! I can’t find where I adjust the speakers since they have been added as surround. I notice that there is ‘stereo pcm’ is that correct?

I’m lost with that! I’ve checked the settings on the TV. Anything here I should be adjusting?