I did as you said and in fact the synchronization works and everything is very smooth, BUT … with these settings I have unbearable flashes. I saw that the problem has already been reported, so it’s not just my system:
https://forums.flightsimulator.com/t/g-sync-causes-subtle-yet-rapid-flickering/366615
Doesn’t that happen to you?
My monitor is MSI Optix MAG322CQR