This is not a Steam key, it is a Bethesda.net launcher key.
It can be redeemed through the Bethesdat.net website as follows:
- Navigate to https://account.bethesda.net/en/login and sign in
- Click Redeem Code on the left side of the screen
- Enter your code and click Redeem
You may currently receive the message "You must be logged in to redeem a code," while already logged in, when trying to redeem a code at the link https://account.bethesda.net/en/settings/general. If you are experiencing this message, make sure you are logged in and navigate to another area of the website, such as https://bethesda.net/en/dashboard, and select "Redeem Code." Alternately, you can redeem your code from the Bethesda.net Launcher directly (see below).
Or within the Bethesda.net Launcher app:
- Start the Bethesda.net launcher app and log into your Bethesda.net account
If you don't already have the Bethesda.net Launcher app, download it via https://bethesda.net/en/game/bethesda-launcher
- Click the menu icon in the upper left corner and select "Redeem Code":
- Enter (preferably via Copy and Paste) the key from your fanatical.com order into the dialog and click the "Redeem" button:
Once activated in your Bethesda.net account, the game is downloaded, installed and launched from the Bethesday.net Launcher app - you can use the "My Library" and "Installed" filters in the "Games" selection to list only the games you own or have already installed: