I am doing something using the same devices as yours, using particle debugger and RedBear BLE Nano.
I got stuck at when I want to monitor the serial using Arduino IDE.
I think I should have already installed the driver for Particle Debugger.
BTW, I using the sample code of old RedBear BLE Nano 2, the HRM sample, I could monitor the output on Nordic APP. But when I using serial print and want to monitor using Arduino IDE. There was nothing.
If you know any solution about it please kindly let me, I will be very grateful.