Toggling Settings>Device Preferences> LED Indicator>Built in MIC LED - has no effect on this yellow Notification LED. The X950G doesnโt even have this LED, this is new on X950H
Itโs a bug. You can get the led to turn off by going to Settings > Date and Time > then toggling use 24 hour time on and off. It will come back randomly, but this always works to get it to turn off for a little while.