Microsoft Store - "This code has already been redeemed" error message

If the message "This code has already been redeemed" appears, it means that:

• You're not logged in to the Microsoft Store app with the email address used to purchase Microsoft Flight Simulator/redeem the code.

or

• You're trying to redeem the key on the same account again. 

Warning: If you have purchased a second-hand copy of the boxed version, the previous owner cannot sell the license or the Microsoft Account attached to it. You will need to purchase a game license from the Microsoft Store.

In order to download the launcher again or to launch the game, please follow the steps below:

1. Bring up the Microsoft Store app
   • By clicking on the Store icon in your taskbar
   • By Pressing the WINDOW icon key on your keyboard then typing "Store" > Open
2. Click on your profile icon in the top right corner of the screen.
3. Under your email address, click on "Sign out".
   
4. Click on the icon in the top right corner, then click on Sign in.
5. Sign in with the email address used to purchase Microsoft Flight Simulator/redeem the code.
6. Click on the Library icon
   
7. Click on the filter "Games"
   
8. In the list, select Microsoft Flight Simulator then click Install.
9. Once the app is installed, click on Open to launch Microsoft Flight Simulator and install the packages