It seems that the Package Tool shipped with the current SDK cannot find the Steam Installation properly and fails. If you have problems then Asobo are working on a fix
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C:\Users\dickl\Desktop\Smiley02>D:\Programs\Steam\steamapps\common\MicrosoftFlightSimulator\fspackagetool "C:\Users\dickl\Desktop\Smiley02\SimpleAerialProject.xml" -outputdir "C:\Users\dickl\Desktop\Smiley02" -tempdir "D:\Temp" Error: Failed to Activate App Microsoft.FlightSimulator_8wekyb3d8bbwe!App. hr = 0x80073cf1
D:\Programs\Steam\steamapps\common\MicrosoftFlightSimulator\fspackagetool "C:\Users\dickl\Desktop\Smiley02\SimpleAerialProject.xml" -outputdir "C:\Users\dickl\Desktop\Smiley02" -tempdir "D:\Temp"
One of the devs confirmed the other day that it is indeed opening the MSStore app and are hoping to change that.Looks like it is trying to activate the MS App which I don't think you have with the steam edition. It should be activating the Steam app. Perhaps this is the issue with the SDK for steam users. Have you tried doing this with the in sim editors?
FYI: I have been trying to compile aircraft. I have the Steam release. I get the same error. I can launch the package tool from within the sim, by opening the project and selecting "compile". This adds the loading times into the dev process.
FlightSimulator.exe -I ";" BuildAssetPackages <path to XML> <temp path> <output path> Force Console
FlightSimulator.exe -I ";" BuildAssetPackages "E:\msfs\SimpleAirport\AirportProject.xml" "E:\msfs\SimpleAirport\Tmp" "E:\msfs\SimpleAirport\Output" Force Console
D:\Programs\Steam\steamapps\common\MicrosoftFlightSimulator\FlightSimulator -I ";" BuildAssetPackages "C:\Users\dickl\Desktop\SimpleAerialt\SimpleAerialProject.xml" "C:\Users\dickl\Desktop\SimpleAerial\Tmp" "C:\Users\dickl\Desktop\SimpleAerial\Output" Force Console