ATC does not give me complete climb instructions

[JiBrady 20]

I use simbrief to create a flight plan. For example KSJC to KLAS. The cruse altitude is set at FL390. After takeoff I am given a couple step climbs to something like FL170. But then I never receive any more step climb instructions. What am I not setting up correctly so as to be  told to climb to FL390? 

Thanks,Jim

[Tuskin38 6,621]

Cruise altitude only works when set with the flight planner from the main menu. If you set up a flight after loading the flight, you'll need to manually request flight altitude increase to cruise.

Edited October 29, 2021 by Tuskin38

[sd_flyer 6,073]

If you stuck at lower or higher flight levels you can ask ATC to decrease or increase altitude

[JiBrady 20]

I did some more testing. When flying the Longitude or the TBM930 then ATC does give me altitude step climbs all the way up to the planed altitude. So for now only the FlyByWire A320NX fails to receive climb instructions.  I have tried both the stable and development versions.