External Camera Not Recognized

Configuration:

• iPad Pro (10.5-inch)
• iPadOS 17 beta 4
• USB USV Camera Nexigo N940P 2K
• Apple Lightning to USB 3 Camera Adapter

1. Attaching the adapter to the iPad caused it to update driver software - so far ok
2. Next attached USB Camera to adapter and iPad complained "Not Enough Power ...".
3. Attached power to lighting port of adapter. Above warning cleared.
4. FaceTime didn't recognize the External Camera. I went through the usual unplug routine with no luck.
5. Xcode sees the iPad so I executed the Objective-C version of AVCam from the presentation and added breakpoints at "AVCaptureDeviceDiscoverySession *externalVideoDeviceDiscoverySession = [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:@[AVCaptureDeviceTypeExternal] mediaType:AVMediaTypeVideo position:AVCaptureDevicePositionUnspecified];"
6. The externalVideoDeviceDiscoverySession shows no attached camera.

Does anyone have a suggestion for debugging this? Or share your working setup? Thanks!