Good morning,
from some weeks i encounter a problem with the refueling of the A20N FBW (stable version) in MSFS2020 and GSX in revision 3.5.6 (Release Channel).
On EFB the voice for GSX Synchronization are enable

as from FBW documentation, as you can see in "Immagine1".
On the EFB is correctly indicated (call GSX Refuel) and refueling in real time, see "Immagine2"
When the fuel truck arrives and is connected to the airplane the "Immagine3" appears and if i'm not wrong i have to choice number "8" because is related to SIMBRIEF plan, the first seven for me are totally unknown.
From now on the truck waits 20 second then disconnect from the airplane and go away without start the refueling.
In "Immagine4" you can find my actual GSX settings, probably it's my mistake but i don't understand what and where.
Thanks in advance and regards
Massimo Turso