I realize this is a specific question but I'm having trouble with having CYBLE-202007-01 BLE module communicate with a BNO055 absolute orientation sensor (IMU) (https://learn.adafruit.com/adafruit-bno055-absolute-orientation-sensor/overview). The bluetooth module advertises but when connecting to it with my laptop, it shortly disconnects. This problem doesn't happen with communication of the bluetooth module and a load cell however. I can include the code if that would be helpful.
Can you probe if the I2C communication with the module is working fine. Can you also check if the code is getting stuck somewhere due to the I2C connection? Can you first create an I2C interface only project with the IMU module and check if that works.