Redfall Cross-Play, Cross-Save, And Co-Op Progression Explained - GameSpot

Yes, Redfall has cross-play, though it has one minor extra step if you want to utilize it.

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Player One Podcast

Does anyone know if progression will be shared between PC and Xbox

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Co-op FPS Redfall: ONE Esports exclusive hands-on preview

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Does Redfall Have Crossplay? Answered

Does Redfall Have Crossplay? - N4G

How to enjoy co-op and crossplay with friends in Redfall