Start a communication with Portenta H7 via Bluetooth

Hi guys, I was fascinated by the portenta H7 and I decided to buy it. To test Ble connectivity, I followed some documentation, which suggested some apps for the communication. I used an nRF on a smartphone as central to control the led built in the board. All worked well till when I tried to do the same task starting from the association of the smartphone. This is because I would like to use my external app. The problem was that my devices found the portenta but they are not able to pair it. Do some of you know the error? Furthermore, I would like to see if I can use the Bluetooth classic in portenta H7. It is supported but there isn't any example. Any of u guys have worked with it?