I'm intrigued by your situation and your rather unique problem of having a camera under warranty that will not be supported by the retailer without additional fees -- exorbitant ones at that. After a little more curiosity being aroused, I'll guess this is the camera you purchased.
https://www.cctvcameraworld.com/wireles ... ullet.html
The good news is, it's still an OEM Dahua device. The bad news is, it is likely a 'gray market' unlabled device with outdated firmware that if upgraded to the latest version wouldn't necessarily 'brick' the camera, but you would need to learn Chinese (literaly) to use any of its features as that is the firmware that would be flashed. The practice of buying 'no label' OEM Dahua for rebranding is not unusual with several well known retailers doing so in an honorable fashion. The retailer involved here is looking more and more likely to not fall into that catagory.
If that is indeed the camera you purchased and is still covered under any type of warranty/return policy, return it at the earliest opportunity as defective and demand a full refund without hesitation. If they fight the refund, fight back. Worst case, demand a replacement unit. They'll either comply, or you'll find out just how fast their 'support' becomes 'free' when being faced with having to issue a refund for a bad product. Or they just hang up and you know exactly where you stand as a 'valued customer'. Their lack of support without additional fees is simply unacceptable by any reasonable standards and I would personally dump them on that principle alone. If you like the camera otherwise, buy a legit Dahua at half the price which will come with an international support structure along with a network of thousands of happy Dahua users always willing to assist in forums like these.
https://us.dahuasecurity.com/product/n41bd42-w/ (The 2.8mm version)
If you are already stuck with the camera, and to not stray too far away from the foundation of this particular forum, there are a few other things that can be done to further identify what may be prohibiting it from being used with Blue Iris -- at least in wi-fi mode.
Accurately identifying the camera would be a start. Your particular method at least identified it as a Dahua device, but obviously not the correct one -- unless of course it has been flashed with incorrect firmware somewhere along the line, or has a very stripped down version of the same basic board as identified -- or both. (Identifying it will also provide a much more solid position from which to handle retailer push back should such be necessary.)
Cross-reffing the current firmware and build to known Dahua documentation could help define where the camera stands in relation to other versions, good, bad, or upside down...., provided this actually
is a Dahua camera.
Two other tools in particular can further analyze both the hardware and the firmware of the camera. The first would be ONVIF Device Manager. The second would be nmap.
Both are powerful tools. Each present a bit of a learning curve with ONVIF Device Manager being the most intuitive of the two while nmap is more involved, but also more capable. If you are running a network and setting up device address reservations and such you should be able to find your way around both. They're free and open source with no baggage. On the other hand, none of this may be worth your while, but here are the links nonetheless.
https://sourceforge.net/projects/onvifdm/
https://nmap.org/
Again, revisiting the wi-fi setup section in the webUI configuration menus may provide the answers. Finding where to set up SSID and wi-fi login credentials seems like it would be a fairly prominent and detailed feature.
I apologize for even asking this question, but are you running an active 2.4gHz band on your WAN?
It also occurs to me that your mystery 'wi-fi' connectivity without actually being on your WAN is likely P2P via the DMSS app and your hotspot. That would explain the lack of port 80 and port 554 while the others are still active. Just thinking out loud now...
And DHCP may actually be your friend until everything gets sorted out.
Here to help.
Good luck.