Enter command: sudo hciconfig -a or sudo hciconfig dev, error message returned: Can't open HCI socket.: Permission denied

Bluetooth Information
Installed BlueZ using: snap install bluez,
enter command: sudo bluetoothctl -v, returns version 5.47
enter command: sudo systemctl status snap.bluez.bluez.service returns following:
               Loaded: loaded (/etc/systemd/sysem/snap.bluez.bluez.service: enabled: vendor preset: enabled)
               Active: active (running)
enter command: sudo hciconfig -a, returns Can't open HCI socket.: Permission denied
enter command: sudo hciconfig dev, returns Can't open HCI socket.: Permission denied

OS Information
enter command: cat /etc/os-release, returns NAME="Ubuntu Core", VERSION="16"
enter command: hostnamectl, returns Kernel: Linux 4.4.0-1110-raspi2, Architecture=arm

Device Information
Raspberry Pi model 3

Question
How do I fix the permission denied issue so that the hci0 device can be accessed using hciconfig and/or hcitool?