From what I understand, the ID can be set any number when you are still in testing stage, but if you need to public as a product, you sure have to ask APPLE to give you one. This is business issue.

Thanks very much for your comment, I can set the isCameraAssistanceEnabled successfully, but still some Iphone cannot output the direction information and some did. From the APPLE document ,"On iPhone, it’s possible to recieve direction for nearby third-party accessories in sessions that enable isVisionAssistanceEnabled." I am not sure is it the reason , I cannot find anywhere to set isVisionAssistanceEnabled, do you have any idea?

Hi all, suddenly found this post as I face this problem for long time, and I debugging it without any idea, Yes, i also suspect they change to 1 antenna in Iphone14 so that there is no direction information in nearby, but on the other hand, there air tag is working fine in their FindMy apps with direction, seems multiple antenna still exist , what do you think?