You will be prompted to sign in or create a new account when you open the game for the first time. Follow the steps below to ensure that your Rocket League and Rocket League Sideswipe accounts are linked:
- Download Rocket League Sideswipe
- Open Rocket League Sideswipe
- Accept the EULA
- Tap the Next button
- Tap Login with Epic Games
- Tap Sign in
- Sign into your Epic Games Account (the same one that is tied to Rocket League)
You can login with any of your platforms as long as it is currently linked to your Epic Games account.
If you have already created a new account, you will need to sign out and log-in with the steps above.