EndevourOS does not have Bluetooth enabled by default.
Here are the steps to get it working:
# install the bluetooth packages
sudo pacman -S --needed bluez bluez-utils pulseaudio-bluetooth blueman
# restart pulseaudio so that the bluetooth module is loaded
pulseaudio -k
Subsequently, to use Bluetooth,
# start the bluetooth daemon
sudo systemctl start bluetooth
# Use blueman to select bluetooth devices to connect to
blueman-manager
References: