IFR clearence works sometimes and sometimes not

[CptBayer]

Hi,

I setup the thing with sync MSFS flight plan in the EFB as described. But sometimes it is noit possible to get IFR clearence. Last case started the flight direct with running engines on the runway. At this point MS gave takeoff clearence so you can go for the IFR flight plan clearence after takeoff.

Whe starting cold and dark.... no problems with the clearence ...

greets