Arnauld Thank you for trying and letting me know.
Feel free to re-enable Secure app spawning, by the way.
Go to Settings > Apps > Play Store > Install Unknown apps > Enable "Allow access to Android/obb folder" if it's disabled. Uninstall Lumafusion and install it again through Play Store and see if it works.
Also, you mentioned it's on a profile, can you try it on the owner profile and see if it works? I don't see why the profile would make a difference, but it's worth a shot.