Minecraft windows 10 edition redeem code error

Solution 1:

  1. Go to https://account.mojang.com and look for Minecraft: Windows 10 Edition Beta.
    There is a table with a Gift card column: Copy the given key to your clipboard (Ctrl+C).
  2. Open the Windows 10 Store app, click onto your profile picture and select redeem code (or similar, my store is not english).
  3. Now log in to your Microsoft account and paste the copied gift code into the only input box and hit Redeem.