PC Mouse Disabled / Locked to Keyboard-Only in Online Multiplayer

On laptop (Predator PHN18-71), external mouse + built-in KB/touchpad. Mouse works perfectly in menus, solo Kick-Off, Squad Battles. In ANY online multiplayer (Rivals, Friendlies, etc.) the mouse is ignored/frozen—no camera control, aiming, or zoom. Game acts like 'Keyboard only' mode is forced. No controllers ever plugged. Tried: fcsetup.ini edits (PreferredInputDevice=KeyboardMouse + ForceSingleInputDevice=0/1), touchpad disable/enable, crossplay off, overlays off, Steam Input disable, launch options (-windowed -noborder), read-only ini, FPS cap 60/VSync. Nothing fixes it. Verified files, latest drivers. This is unplayable for KBM online. Please acknowledge/fix!