Thanks for the reply. I feel a bit foolish but can own up to my mistakes. I had simply inserted the OEM mounting hardware directly into the holes on the PUIG screen and didn't realize there was additional mounting hardware, which I subsequently found taped to the inside of the box. Your reply and the photos on the PUIG website gave me the clue I needed. Thanks again!
It's kind of strange that Fortnine's website doesn't list the screen as available when you select the 2021 bike (but does for 2020), which is what led me to believe there was a difference.