I just bought a 2018 Subaru Legacy Limited and all the manufacturers materials say it supports CarPlay. CarPlay is an app listed on the screen, but my iPhone 6 won't connect. The CarPlay app seems to be greyed out and the screen says "smartphone connection error" when connected via USB. I noticed that the 2018 Legacy is not listed on Apple's official list of supported models. The software on my phone and car are both up to date and I'm using an Apple lightening cable.