Problems with Elite Misoru b+

I try to use the Misuro B+ on a Novo Force 8. The application find the sensor, but only with the power and the cadence, it doesn’t find it on as speed sensor. And the power always stays at 0, so when i start the race, the rider on the screen don’t move. I use a android smartphone with bluetooth, and I also try with an
apple ipad, but same problem. (sorry for my english, i’m speaking french). Can you help me ? Thanks.