To connect all of your Rocket League accounts to your Epic Games account, follow the steps below!
The first time you launch Rocket League, you will be presented with a screen asking you to either Sign In to your Epic Games account or Create an Epic account.
Note: Creating an account at this step will create a ‘Nameless’ Epic account with no details. There will be no name, email address, or other information attached to the account.
If you have an existing Rocket League account, select ‘Sign In’ and you will be prompted to visit the ‘Account Portal’.
From here you will be taken to the ‘Connections’ page of your Epic Games account where it will show a green message at the top ‘Account Updated!’. Refresh the page if you do not yet see the connection.
Return to the game to find your accounts linked!
To add more linked accounts, visit https://www.rocketleague.com/activate and follow the guide How do I link multiple Rocket League accounts to my Epic Games account?