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Knock on feature g3 not working

I had the software update last week and now all of a sudden my knock on feature doesn't work.  I used to be able to double tap and the screen would turn on but it won't now and I used that feature a lot.  Please help

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Re: Knock on feature g3 not working
Customer Support

Silverdolphin99, I also use that feature on my device. Let figure out what is going on. Are you able to unlock the screen using the Power Key? Do any error messages appear on the device when you try to use the Knock Knock service? Let’s make sure the feature is enabled as well:
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