I’ve tried all of the steps. This is ridiculous. It used to be really easy to connect 2 roams but when there’s an update, you have to delete the system, reset the speakers and set everything back up again. Every time you want to create a stereo pair. Please fix the issue.

What did Sonos Support say, when you called them to discuss it? 

Are you creating the stereo pair over Wi-Fi as you should or are you sending music via Bluetooth to one speaker which in that scenario creating a stereo pair is not possible.