Experiencing the same issue today (yesterday all was fine). Blank maps in the Ingame Panel of MSFS, also in the AllInOne Panel. Cloud and iOS app work as usual. PS: only the satellite map seems to work (IFR, VFR, World Map don’t).
Sounds like the same problem like here:
https://forum.navigraph.com/t/navigraph-icon-showing-but-maps-in-game-panel-wont-open/7430