Yea, on Android I went to each camera stood in front so that my face was looking directly at it, no luck. Then on an iPhone, I removed the VDB from CamPlus and added it back after I backed out of the CamPlus location and went back to it. Then I stood in front of the VDB and it recognized me. I then did the same for the rest and they all started to work. Hopefully, you will experience the same as I did.
Here is my link to my testing and experiment, This is the start location, go through the thread: