Calls to GetLoginItemSettings (amonst others) will get GetAppUserModelId which will implicit set a new one if there hasn't been a user defined one yet.  This causes an issue in a UWP environment where the AppUserModelId is system defined.

On the latest versions of windows the AppUserModelId defined for your notification must match exactly the one defined for your process or no notification will appear.  Got a fix in the works for this just raising here for tracking purposes.
atom/browser/browser.cc
if (version_override_.empty()) {
    std::string version = GetExecutableFileVersion();
    if (!version.empty())
      return version;
  }
  return version_override_;
}
void Browser::SetVersion(const std::string& version) {
  version_override_ = version;
}
std::string Browser::GetName() const {
  if (name_override_.empty()) {
    std::string name = GetExecutableFileProductName();
    if (!name.empty())
      return name;
  }
  return name_override_;
}
void Browser::SetName(const std::string& name) {
  name_override_ = name;
  brightray::OverrideApplicationName(name);
}
int Browser::GetBadgeCount() {
  return badge_count_;
}
bool Browser::OpenFile(const std::string& file_path) {