I have a new Sub Mini. I have added it to my system and it shows up as Sub Mini not assigned. If I go the room I have named Library the App tells me I have a stereo pair consisting of a Play 1 left and a Play 1 right. I also have a box which says Connect Sub + and Remove Sub X. If I press Connect Sub I get a new window which says “Let’s add a sub to Library” I then click on Continue. I then get a picture of a Sub Mini and I I am asked to select the sub. I then collect on select. I then get another picture of a sub mini and a box which is a long horizontal slit. A black line Strats to go across and then the screen changes and the message “There was a problem adding your Sub Mini. Check the network connection and make sure that your subject is powered on.” Underneath is a big exclamation mark ! in a circle. Below that a “Try again” button. So, as far as I know the Sub Mini is on. It has a steady white light and my system can see it. I have no idea how to check my network connection but I can use the App on my phone and select music to play on my stereo pair of Play 1s in the room known as Library. Any advice on what to do next would be very much appreciated. Thanks
A quick first try would be to power down all Sonos, reboot the router and power the Sonos back up.
Next I'd do a system update (settings manage) to make sure all are on the same versions of the software.
It can help during setup to hardwire it with Ethernet cable to your router. Once bonded to your stereo pair you should be fine removing the cable and using wifi.
Thanks. Finally got through to Sonos support this morning in under a minute. I was told 50min wait last night!! Problem instantly solved. Unpair the two play ones. Add one back to the “room”, then add the subwoofer to the room which it did no problem, then add the second play 1 as a stereo pair. Now all work just fine! 
Thanks again! 
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