The Sonos Roam and Sonos One SL (setup on an S2 system) cannot be used within an S1 Sonos system as they are not compatible with S1.
A Sonos Beam (gen1) is both S1/S2 compatible, but the Beam (gen2) can only be used with S2.
A Sonos Connect (gen1) is S1 compatible only and a Connect (gen2) is both S1/S2 compatible.. you can read more about these things here in this link:
https://support.sonos.com/s/article/4786
If the Connect is no older than March/April 2015 you might (hopefully) find it will run on S2, alongside your existing Sonos products.
In front of the serial number on the Connect is a four digit code in the form YYMM (e.g. 1603 = March 2016). It will be gen 2 if this date is Feb 2015 or later (or possibly March 2015 or later, nobody seems totally confident of the exact date).
If it’s a gen 1 you would be best advised to put it back on eBay and try and track down a gen 2. Most adverts for Connects for sale indicate whether gen 1 or gen 2, because of the crucial difference it makes. Was that not stated when you bought it?
Looks like is it from 2014….so there is no hope of it working with my existing Sonos products?
Looks like is it from 2014….so there is no hope of it working with my existing Sonos products?
Sorry, but it simply cannot. A gen 1 Connect can’t run S2.