Up to a few weeks ago I had my NC450 added to BI and working fine. Today BI-version 5.4.0.0 no longer recognizes the NC450(there has been no updates) and a BI search does not find it either, I have manually tried Onvif and selected TP Link H.264/H.265, HTTP, MPEG4 & RTSP. I have 2 other TP Link C200 cameras connected as well as a fleet of Amcrest cameras all of which I have no issues. There have been no changes to my internal network, so I'm at a loss as to why BI no longer can find/add the NC450, I can connect to the camera via the app internally and externally.

Any assistance would be greatly appreciated

Can you see which onvif port it is connecting to ? The www shows it may be 3702. It is possible for BI5 updates to break things in the search for better functionality