Using a Samsung 7, I can debug on this phone just fine. But on both this phone and a Samsung 6 (running Android 8.0) my package is no longer installing. I can install it on my One+ phone just fine. I did recently upgrade VS 2017 to 15.9.3, but am not sure this is related. I am targeting 8.1 (Oreo) and all three phones are running 8.0. I crawled around the Internet but could not find anything definitive to help with this issue. Any help/pointers would be greatly appreciated.