I had observed this issue previously and never realized it was related to Duo RDP. I know now that it is because this issue had gone away with a new installation and started again after installing Duo RDP. What happens is that when the screen locks after, say, 5 minutes of not being used, when I go back to try to log in again, instead of seeing the username and password prompt, I see a blurry lock screen with nothing except the power and accessibility icons at the bottom right. There is no way to make the username box appear. Is there an option in Windows that I can change to stop this happening? This only happens with Duo RDP installed.
I know this is an issue because there are other threads about it. How do I stop this from happening without uninstalling Duo RDP?