Editing Bluetooth Audio (section)

=== AuthenticationFailed ===
Solution 1: https://wiki.archlinux.org/index.php/Bluetooth_headset#Pairing_fails_with_AuthenticationFailed

Basically, type <code>hciconfig hci0 sspmode 0</code> as the '''root user''' (sudo). If this won't work (command not found, etc), hciconfig may not be on your system anymore due to it being deprecated.

Solution 2 (if Solution 1 doesn't work): To solve this, install the [https://aur.archlinux.org/packages/bluez-utils-compat/ <code>bluez-utils-compat</code> package from the AUR]. (Arch Linux) or similar on another distro. (Source: [https://www.reddit.com/r/archlinux/comments/5x9yle/where_has_hciconfig_gone/ Reddit post]).

Then in a terminal, type <code>sudo hciconfig hci0 reset</code> to reset your bluetooth pairings and the settings that may have been corrupted and try reconnecting again (using bluetoothctl or the bluetooth menu under system settings).