Hello,
i had this issue and i solved it at the cost of the rubber inside the kinect port at the back of the kinect
i used a flat screw driver to push the rubber which you can see it surrounding the port to the outer side. then, i took it out. after that, i plugged the cable and it was easier without rubber and i managed to successfully connect it by doing this only.
don't worry, you can put the rubber back if you wanted in the future.
i hope this would help
Thanks and Regards