Hello,
I updated to the latest version, and also deleted the entire contents in the %LOCALAPPDATA%\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalState\Packages\inibuilds-aircraft-a300-600.
I'm still getting the same error when requesting simbrief from ACAR. I also tested the connection with other aircraft such as the cargo variant RF, and the same thing.
This is really having me scratch my head, as it was working before and now all of a sudden, it's not.
Any other things I could try?
Tim