In the Bose SoundTouch app, sign out of your Bose account and then sign back in.
Reboot your router.
Routers may need to be reset from time to time—much like rebooting a computer. Disconnect power from the router for 30 seconds, then wait for it to start up and connect. (Note: Any device connected to the Internet will be interrupted during the reset.)
Uninstall and reinstall the Bose app.
In case an issue occurred with the app, uninstall it from your device, download and reinstall it, then try again.