Odd Tapping Sound

[wafflecougar]

Hello everyone! My 2016 650i recently started making this subtle tapping sound. It doesn’t pickup super well on video but in person it’s noticeable but it’s not all that loud either. It doesn’t seem like it’s coming from the engine and when I open the hood I can’t hear anything out of the ordinary but under the mid section of the car and at the back I hear a tap. Any ideas on what this could be? Thanks! Videos below.

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[Walt White Coupe]

I can hear it but it's so minor that I wouldn't worry about it unless it changes dramatically.