Hello, I think I understand the issue you are facing…
When I tried to upload my game to Steam it got declined because i didn’t have Microsoft Visual C++ Runtime checked as a requirement for running the game. I assume you are experiencing the similar issue with Epic Games.
So all in all: If anybody is to run your Unreal Engine game, they will need Microsoft Visual C++ Runtime installed their PC. You will need to select an option when uploading your game, so that Epic know that it needs to be installed with your game if it doesn’t already exist on a PC.
I hope this makes sense 