Description

The device is not able to connect via bluetooth in cause of bluez. It seems to be a common issue on Linux. I have this issue on NixOS.

Workaround

Explicit pairing and trusting

Start the bluetoothctl

bluetoothctl

Then enter the following commands in bluetoothctl:

power on
agent on
scan on
# until your device shows up:
pair <MAC-Address>
trust <MAC-Address>
connect <MAC-Address>