Teenage Mutant Ninja Turtles Shredder's Revenge does support crossplay, but only between the PC and Xbox versions. Not so much for consoles.
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"Teenage Mutant Ninja Turtles: Shredder's Revenge is no stranger to physical releases. Both Limited Run and Merge/Signature Editions have physical published their own physical editions already. Now Merge has announced TMNT: Shredder's Revenge Anniversary Edition, which will bundle the game with the recently released "Dimension Shellshock" DLC. These Anniversary Editions are coming for PlayStation 4, PlayStation 5, and Switch," says Co-Optimus.
"The "Dimension Shellshock" DLC for Teenage Mutant Ninja Turtles: Shredder's Revenge recently arrived on console and PC, adding new playable characters, an addictive co-op survival mode, and more. To learn more about the decision-making and co-op balance behind both the main game and "Dimension Shellshock," we spoke with Frederic Gemus, Game Designer at Tribute Games," says Co-Optimus.
Considering MS releases their games on Steam and Windows store, this seems like them pushing for the extra crossplay feature.
That is the only explanation I can think of for why it would work everywhere on PC, EXCEPT for the Epic store. This also can't be Sony going back to their anti crossplay ways, because Nintendo is also not included.
"However, Dotemu has stated that crossplay between the consoles is something they are looking into down the road." (from the article)
X play or not the game is still fun whether with friends or solo.
Oh, does crossplay matter again?