Cannot join to Sense-network with this Sense IOS app. On the screen there are no a such a button where I can join to Sense-network or Protect this device.
The SENSE app for iOS can only be used for set-up, monitoring and controlling the SENSE router, and is therefore only needed on one device as mentioned in this article.
Are you using this iOS device to set-up the SENSE router? What is the OS version of your iOS device?