Phone is not vibrating for incoming calls and text when set to vibrate.

Hi. I have a samsung galaxy s6 edge. I've just noticed recently that when I set my phone to vibrate during the day at work, it does not vibrate. It stays silent. I've tried checking my settings several times and restarted the phone by completely shutting it down first. Is there anything that I can do to get it to start vibrating again?
Thanks

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