Retired Engineer
Lurker
I have been battling with Microsoft and Google for two years regarding the lack of LED notifications in both Outlook and Gmail Apps on my Samsung Galaxy S7. It is not within the capability of the S7 to flash the LED when new mail arrives and the screen is dark. Save yourself a lot of grief and install the Light Manager 2 App and set the LED to flash with any App with the color of your choosing. The App runs in the background so you will sacrifice a little battery drain but what I have observed so far is minimal compared to the nicety of walking up to a dark screen and seeing the led flashing to indicate a new email, message or phone call.
