connecting pre-amp and turntable to port ?

You need to choose Line-In as a source, or go into the setup for the Port and set Autoplay to On and choose the room to Autoplay to.

See these links for details:

https://support.sonos.com/en-us/article/use-line-in-on-sonos

https://support.sonos.com/en-us/article/adjust-line-in-settings

This one for troubleshooting:

https://support.sonos.com/en-us/article/no-audio-from-a-line-in-device-connected-to-sonos

ok….so i went into the Sonos App and selected the ‘Line-In’ but i cannot find anyplace in the App to set Autoplay to On , i know it is quite difficult to diagnose what is going on but going into the links to explain the steps to get the setting that clearly not there is very frustrating…..i wonder if the Pre-Amp is something not compatible with everything ,

it is a ‘FiiO K5pro’ 

First let’s see of your wiring is correct and we can get some sound.  Scroll up on the room at the bottom to get the Rooms list.  Tap the room you wish the turntable to play in.  Scroll up on the sources/Favorites/etc. which are above the room.  At the bottom will be “My Sources”.  Choose the Line-In.  Play a record, it should play in the room you picked at the bottom.  Make a sure the volume in the room is turned up, and the pre-amp is powered (it it needs power).  

all correct and powered on , np sound….i also know it is fine because i can still disconnect everything and just connect up the 2 red/white leads to my Denon CD Player and it works fine…., 

Is the preamp turned on?

yes , powered up and plugged in as directed  ’jgatie’   from a post above …. 

I haven’t found definitive information on your “preamp”, but I think that it is a headphone amplifier. If I’m correct, this is inappropriate. You need a phono preamplifier. There will probably be a note about “RIAA Equalization”.

Thank you buzz , i think you are correct on the preamp , so will purchase something this week and have another go then report back….thank  :)