I am using Windows 10, UFT version is 12.54, and my Edge browser is 90.0.818.66 (64 bit). I followed the steps in the link below
https://eyeontesting.com/answers/microsoft-edge-browser-and-uft-1254/#gsc.tab=0
And I used, SystemUtil.Run "C:\Program Files (x86)\HP\Unified Functional Testing\bin\MicrosoftWebDriver.exe", "<my test url>" to launch the browser and get the URL, but it does not work.
That version is already the MS edge based on Chromium. The Link you mention refers to the old Microsoft Only Edge version.
Here is the Full Description from Microfocus, although I'm not sure if your UFT version will support it. (WebUtil Object is needed)
Simplified this is what you have to do (in your scripts):
Caveats: