I have a Latitude 7275 and a Dell Active Pen PN350M, however I cannot get the laptop/tablet to recognize the pen input.  I have tried 2 different PN350M's and neither work, however I was able to test both of them with another computer (Lenovo) and they worked fine.  In settings, Windows states that it has Pen and Touch support with 10 touch points.  I have tried installing all versions of the Dell Active Pen driver/control panel and still have not been able to get it to work.