scrcpy white/blank screen (only on second windows desktop)

I have everything working. scrcpy is connected to two windows desktops via wifi.
- on the main desktop I can see and control my android
- the second desktop is also connected and I'm able to control the android. But shows a white screen (so I can't see anything)

I've tried a lower resolution with scrcpy -m 800 -b 2M
(nokia 7 plus, android version 9)

How can I solve this? Thx in advance :-)

Start by reproducing the reported setup: a Nokia 7 Plus running Android 9, scrcpy connected over Wi-Fi to two Windows desktops, with the second desktop showing a white screen. Compare the behavior of the two desktop connections and verify the result using the reported 800px and 2Mbit/s options; done means the second desktop displays the Android screen.

Written by the indexing model from the issue text.