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Crossplay – Steam

Note: Steam and Epic cannot connect to each other via respective platform apps. Crossplay can only occur through in game.

Launch the game.
In the Main Menu, go to “Co-op Campaign."
Select “Crossplay.”
Select “Log in to Epic Games.”
This will open a brief explanation of the crossplay feature, followed by the Epic Sign in Overlay. Follow the steps, signing into your account for Epic.
Once you are logged in, you should see your friends list populated with your Steam and Epic friends -- you can start a Crossplay session.

Connect Steam account to Epic Account

Open the Epic Launcher.
Make sure you are signed into your Epic account. Click your profile image.
Under the drop-down menu, select “Account.” This will pop out a new web browser page and take you to your account settings on the Epic website.
In those settings, Select “Apps and Accounts."
From there, click “Connect” under Steam.
Log into your Steam account connected to your email associated with your Steam account.
Your Steam account should be connected to your Epic account now. NOTE: Be sure to connect the correct Steam account as you will not be able to easily unlink them after they are connected.
From here, Epic handles crossplay and your friends list should be populated with the names of your Epic friends (including the Epic accounts that opted to link their Steam to Epic using the “Crossplay – Steam” steps).

Note: Steam and Epic cannot connect to each other via respective platform apps. Crossplay can only occur through in game matchmaking

Follow the above steps for connecting your Steam account in your Epic account settings.
Launch the game
Go to Co-op Campaign
From there you can co-op as you normally would. There is no Crossplay button for Epic. Instead, your Steam friends need to have enabled the crossplay themselves using the above steps under “Crossplay – Steam” in order to appear on your friends list.