First off you don't have to install Explorer as it is already on the computer (Microsoft simply hides it)....
Second you haven't been here long enough to realize that THESE CAMERAS CAN BE BROWSER DEPENDENT, especially the PTZs. You may think it is nonsense, but it isn't. I have 4 Dahua PTZs and have been there, done that with other browsers. Including this camera.
While it is weird to us that they use a no longer supported browser, there is a reason...
Many manufacturers have focused the firmware around Internet Explorer (which was the standard once upon a time), even brand new cameras unfortunately. Keep in mind we are not the intended audience of Hikvision and Dahua, it is professional installers with specialized equipment and/or don't update their equipment (many still use laptops with Windows 7), so they are not going to invest in changing the firmware until they see a need. As such, those end users usually don't get into the userface like we do.
So until their professional installers and their intended market demand or require it, we won't see it and us complaining they don't care because we are not their intended market. They are not going to reinvent the wheel and throw out all firmware and start new until there is a need. They use their existing firmware as the base and build on it. Some cameras work better than others with different browsers, but IE is the sure browser to work with these cameras.
We are just fortunate to be able to get our hands on these cameras and NVRs.
Third,
@Wildcat_1 works closely with Dahua and tears these firmware apart and provides improvements and suggestions and even he says in multiple
threads with this new web GUI that to ensure full functionality one should use Internet Explorer:
"On The IE front, I am also doing some tests with Win 11 (VM based) running compatibility modes on a number of cams to see if that can get people there without having the overhead of IE etc while Dahua continue to refine the GUI which still needs work under different browsers. As I mentioned before and Wittaj points out, I would always use HEAVY quotes around people stating """""""WORKS""""""" in other browsers especially with Edge since while the onscreen application of a setting may look good, the final result is less than that and often times does NOT lead to settings or features (even upgrades) working as expected."
Fourth, at startup this camera will draw more power.
Have you tried as I suggested and unplugged all other cameras on that switch?
Does the PTZ spin up and can you see IR lights on in the dark? If you can, then it is an issue likely with the browser or some other misconfiguration in your setup.