How do I add my friends from my Steam account to my Epic Games account?
In order to add Steam friends to your Epic Games account you have to link to your Steam account to it:
Login to your Steam account in the Steam client.
Login to the Epic Games Launcher.
On the right-hand side click on the Friends' Icon.
At the bottom of your friends list, locate the "Connect your social account to find friends on Epic Games" line and click on the link.
Click on Steam. Note: If Steam doesn’t appear as an option, you will need to sign in to Steam on your computer then restart the Epic Games Launcher.
Select the Steam account you would like to link to your Epic account. Note: Only the last five Steam accounts that have been signed in to the Steam client on your computer will display. If your account does not appear, please sign in to the Steam client with your desired account then restart the Epic Games Launcher.
In the browser window that opens, sign in to your Steam account. You’ll see the confirmation below after logging in.
Steam friends will now appear in your suggested friends list.