I found a few other posts related to this, and they all mentioned deleting or modifying the PSUserConfig.txt file. I tried these suggestions with no success.
I have a Huion H1060P which definitely has pen tilt functionality. The pen's tilt functionality works in other software (such as Gimp).
In Photoshop, the pen pressure works great, but tilt is not being recognized at all. I have configured my brushes to use Pen Tilt as well. For example, I set the control for brush size to pen tilt with no result.
(By the way..... Is there really no way to configure input devices in Photoshop? That kind of blows my mind)
I just want to add something I found recently. When I set my brush opacity control to Pen Tilt, it works. So Photoshop is definitely able to recognize the input. For some reason, it seems to have problems with using Pen Tilt for more important controls like scatter or size. When I set the control for pen size to Pen Tilt, it actually just uses Pen Pressure instead.