For directly connecting to the PS4 console, turn on Enable Boot in PS4 USB mode and make sure the Titan Two flag is off. A DS4 or a Brook Wingman XE2 must be plugged into the USB-A port. Do not set any USB emulation modes in configuration files.
For non-PS4 console situations, like most of the PS5 or XBox converters, turning on the Titan Two flag is needed to disable the Quadstick's internal authentication code.
For some converters (Beloader brand), the Quadstick cannot determine what it is plugged into, directly setting the emulation mode to 7 will enable full touchpad and motion controls.