STM32L496 USB DFU on Nubleo-L496ZG Eval Board

[MHinz.1]

I have not been able to get the device to enter USB DFU boot mode (hold boot PIN and reset). I've used many other ST devices and have never had an issue with this. I'm sure it's something simple.

What are the dependencices for USB DFU boot to start on the STM32L496 Nubleo-L496ZG Eval Board? I'm gussing some pins may have to be held in a specific state (other than BOOT0) to ensure the USB peripheral comes up in Device FS mode?

Thanks!