My Note 4 won't detect that the S Pen is attached, why is it doing this?

[AC Question]

My Note 4 wont detect that the S Pen is attached

I just bought a used Note 4 on Craigslist And the whole phone functions properly no scratches, Perfect condition and The S Pen Works Perfectly But The phone wont recognize that the S Pen is Docked. Please help its also draining the battery because the phone thinks I"m always using the S Pen.