I was having trouble connecting Sonos to Soundcloud and found this post (https://en.community.sonos.com/controllers-and-music-services-229131/can-t-connect-soundcloud-to-sonos-6897655) which described the issue I was having.    After a bit of mucking around I found the solution which was to enter the code provided on this page. https://secure.soundcloud.com/activate 

Unfortunately the post above was closed for further comments so I could not add my solution so I figured I would create this post.  Happy New Year!