Epic Games requires users to have two-factor authentication enabled to claim free downloads until May 21. Fortnite developer said in a blog post that it was to help protect account security and probably because more people are downloading more free games right now.
If you have not enabled two-factor authentication for your account, the following message will appear when you attempt to claim a free game: “Two-factor authentication required To claim this free game, you must have two-factor authentication configured for your account. Two-factor authentication provides a additional level of security for your Epic Games account and helps prevent unauthorized access. »Go to your Epic Games account settings to enable two-factor authentication. Two-factor authentication can be used to protect your account from unauthorized access by asking you for a enter security code when you log in.
See: Epic games that require two-factor authentication to claim gifts