I can't recall specifically when this started happening, but iMessage/Messages notifications no longer light up my iPhone 7+ (therefore running iOS 10) screen when received. Other notifications seem to operate fine. Please note I am not using DND (I know what this is), and I have all notification functionality enabled in settings. I've read some people having this issue, and are labeling it an iOS 10 bug. Seems a little unreasonable if that's the case, so I'm hoping it's something wrong on my end. I also have an Apple Watch, if that matters at all. Anyone in the same boat, or have any advice? Thanks!