First, keep in mind that this is a VARIFOCAL and not a zoom camera. It is meant to be set to the need focal length, zoom, at installation and left that way. The mechanism is not meant for regular or constant zoom use.
If it's not working in BI that is probably because the camera type is not properly configured in BI. I have a 5231R-Z, similar camera without extended PoE, and have it configured as the 4431 selection from the Dahua drop down list.