Vibrate mode doesn't work? Lg 7 thinq

Hello i need help with my lg 7 thinq. My phones vibrate mode doesn't work. When i set it to vibrate it doesn't vibrate like it should. For example if i get a message it should vibrate but it doesn't any notification i get it should vibrate but it doesn't vibrate. I need help to fix it or feed back. Thank you!

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