Jay, I see the exact file EAC is complaining about is Microsoft.AutoSuperResolution inside WindowsApps. On Copilot+ PCs, AutoSR can hook into games, and some EAC titles treat that hook as untrusted. Turn Auto Super Resolution off just for the game.
Close Steam completely. Open Settings with Win+I. Go to System > Display > Graphics. In Custom options for applications, find Dead by Daylight. If it is not listed, use Browse and add the game's exe from your Steam folder. Open its options and set Automatic super resolution to Off, then save.
Launch the game again. If that does not clear the pop-up, tell me what changed and we will move to the next step.