How do I use the mouse to look up/down? I can look left and right.

Aiming is set to Mouse Axis X. I can set it to axis Y but that uses that axix to look left/right. Is there a way to set aiming to X and Y?

I was able to fix it by resetting player control to defaults.

Aiming has be set in both primary and secondary controls. So primary is set to Mouse X and secondary is set to Mouse Y.

For some reason, all my secondary controls were set to a controller even though I didn't have a controller connected.

I fixed this issue without having to reset the bindings. The control bindings menu isn't very intuitive, and it wont let you double bind look / aim to mouse and controller at the same time. You have to set the primary Aiming control to the X Axis and the secondary Aiming control to the Y axis. So if you want to swap between mouse and controller you have to change both binds to the two axis for control type you want to use.