Experiencing the same issue
Same.
Same getting Fatal Error on Shipping Builds with DLSS 4 ..
I believe that I managed to fix that by copying the plugin files into the project folder not just the engine directory.
Ipasted them to: %ProjectFolder%\Plugins\Runtime\Nvidia\DLSS
A fix was found here : Unreal Engine 5.5 with StreamlineCore plugin need Streamline plugin?
A variable name is wrong in the code of the plugin and must be changed
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