Make sure copilot controlling ATC is off in assistance options or it’ll still try to give you vfr commands. I find making a flight plan in web interface at planner.flightsimulator.com a lot easier and the opening the plan in the EFB. Then send to avionics. To be honest it’s hard to deal with this sim its got so many bugs, hard to complete a flight that doesn’t go wrong somewhere. Good luck.