So, according to their website:
The brain and WiFi connection center of the Cubes is a
SparkParticle Photon
That means you shouldn't try to use the Spark Core app, but rather the Particle app. The setup process is different and they need to be treated as such. Give that a try, and let us know if that works for you.
Also, try not to create new topics for things you're already being helped with on another topic...