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"Hey Google" hotword not working from the lock screen

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Senior Member
Apr 8, 2017
OnePlus 7 Pro
I'm using Android 9 on my OnePlus 7 pro. Suddenly, one day my "hey Google" stopped triggering from the lock screen somehow. Once I wake up the lock screen by double tapping on it, it starts working. I went into the Google Assistant settings and made sure that it could be activated from the lock screen.

Any tips on how to make this work again?