Us top spec 🇺🇸 model comes with fog light at rear. Low spec model EC comes with 2 red reflector ...upper trim comes with rear fog on driver side and red reflector on passenger side.
Ec with rear fog will come with same switch as outlander...however there are multiple ways of choosing how all light operate and I believe in Aries situation his model was set to operate as a day running light feature... its not any electrical wiring issue... its just settings... it can be set to use switch independent.
I believe I had selected this option where I opted for fog light to come on when I remote open asx/outlander sport ... but I change it back as I already had daylights and I prefer independent controll.... never done it on eclipse cross though.
Aries option is to ask a dealer tech to change preference ..hopefully he like you enough to do it for you otherwise find a programmer.
But its always good to have prior knowledge to tell dealer what you want to change ...than for them to spend long period of time searching for an option that might mess up your setting and then blame them