Try again via the PC or Mac desktop app (downloadable via the Sonos website).

The challenge is, of course, that Sonos doesn’t mention an error of 1108 in their FAQ. Can you post a picture of this error? If the above suggestion doesn’t work, you may need to call Sonos Support directly to discuss it.

When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

I am also having this issue with my move2. But I lost connection to all Sonos devices also.

would love some help here also. New to Sonos 

​@Ta0 
Did you follow my suggestion?

Interesting, not sure I’ve ever seen that error before, and frustrating that it isn’t mentioned in the FAQ. 

Suggestions would be few, make sure that the WiFi is turned on the device you’re trying to bond the Sub to. It can’t be bonded to the Move, either. Try wiring both the Sub, and the speaker you’re attempting to bond it to, to your router with Ethernet cables, just to lock out potential wifi interference , since the Sub is trying to connect to its bonded speaker. It can do that through the router but prefers an WiFi connection to that speaker, not your WiFi.  And, of course, as previously suggested, contact Sonos Support directly to discuss it.

Oh, make sure you’re not running any VPN or port blocking software, either, while attempting a setup. 

Problem solved ! After discussion and help of Sonos online assistance, I’ve restarted my phone and phone app + switch off the wifi repeater located at first floor of the house and of course proceeded to a full reset of my Sonos Arc and Sub