I have been talking with LG support for the past few days to get this fixed. It took some back and forth but after pointing out to them that the H910 (AT&T model V20) is not even listed on the SmartWorld website
http://us.lgworld.com/ (if you visit the SmartWorld store on your PC and click select phone on the right) they finally said they would look into and I noticed today that the H910 actually appears there.
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However the other problem is that several of the themes they have added since launch do not have the H910 listed as a supported device
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And Home Theme+ still dose not show up under customization in the SmartWorld app on the AT&T V20, but you can access the section by going to Settings>Themes and taping the download icon, but any themes that that do not have the H910 listed as a compatible device will not show up. I'm hoping this will all get sorted in the next week or two. I plan on staying on them till it gets fixed. It's annoying when they try to blame it on my device and tell me to do stupid things like re install the app