Dying Light 1 Co-Op and Epic Online Services

Hello! I recently purchased Dying Light 1 Definitive Edition on Epic Games and I'm playing it on Deck via Heroic Launcher added as a Non Steam game. I've reached a point in the game where I can play online. The game wants me to connect to Epic Online Services and I've enabled the overlay in Heroic, however I still do not get any options or prompts for signing in.

Can anyone help?