Offset problem when tracking object with external camera and use this data on Hololens

Hi All, I have a problem with the tracking data (recorded with an external camera) which I use on the Hololens 2 to display an object. I am currently working on an AR Unity project with Vuforia. I have one Unity project on the PC with an external camera and one project on the Hololens 2. I track an object with an Objecttarget with the external camera and I send this tracking coordinates to the Hololens to visualize the object there. For the registration of the data I have an additional multitarget, this is tracked by the external camera and the Hololens. Tracking on the PC works well, but when displaying the object with the tracking data from the PC on the Hololens, I get an offset. This varies depending on where the object target is located. There is an ideal point where the object is perfectly placed. If you get closer to the camera from this point, the offset towards the camera becomes larger and larger. If you move further away from the camera, the offset away from the camera becomes larger and larger. I use Vuforia 10.2.5 and Unity 2020.3.16.. The external camera is the Logitech BRIO (4K Pro Webcam). Does anyone have an idea how I can solve the problem?