Open the Sonos app on your device

Open the menu

Press "Add music services"

Select "Tunify For Business"

Select "I already have an account"

Click on "Allow"

If you are not yet logged in to MyTunify, you can now log in with your email address and password or with a player code

Click on the zone you want to use to play music through your Sonos speaker.

You will automatically return to the Sonos app

Click on Tunify For Business with your chosen zone

Press 'play'