At the end for those who have this problem such as mine I had , I suggest You to go to your
C:\Users.…\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe ((ms store)) folder and first go in localstate then dce and delete dce content then go to packages in localstate and delete them all then delete dat files in LocalCache\sceneryindexes and open LocalCache\SimObjects and delete all planes in LocalCache\SimObjects\Airplanes then open xbox app and log out then delete all cloud saves ((link is shared in this discussion)) and login as your account ((for me that i had game pass had no problem by using an other account)) then try again
i believe its last solution for who tried every thing hope it helps you
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