Nano 33 BLE Documentation BLExAR

I'm trying to get the Nano 33 BLE up and running without much success. Works fine with various sketches but no success getting BLE operating. Very poor to non existent documentation. Not like Arduino to release a product like that. Ideally, I'd like to operate the Nano 33 BLE from the iPhone, BLExAR, for example.
Has anyone had success getting this MC's BLE to work?
thank you,

Have you been using the ArduinoBLE library?
I don't have a lot of experience with BLE, but I was able to write some sketches using the Nano 33 BLE's BLE capability based on that library, reference, and example sketches without too much difficulty.