DFU Standalone not working outside of Arduino IDE ?

Greetings,

I am trying to work on the Portenta H7 using the STM32Cube IDE. The DFU Standalone project example works perfectly on the STM32H745 Discovery but when I try to run it on the Portenta H7 (STM32H747), the USB FS is not detected on the host PC. I was wondering if there are any additional configurations to do on the Portenta H7 in order to enable the USB FS ? Has anyone faced any similar problems with the USB on the Portenta ?
Any kind of help is appreciated.
Thank you .