Rod, no apologies needed for long posting (some may say this is self-serving as I contend for the title of ‘longest postings in the Community’ award 
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Glad to here you and @Notter collaborated and you’ve moved forward to have a working solution.
Explore the drivers as suggested by @Majik and then you may find that you don’t need Audacity to produce a simple single-take video in OBS. With OBS and the appropriate plugins you will be able to setup a scene that can receive audio input from both channels of your 2i2 individually. If you’ve not yet read this Topic then take a look for more on that: Using OBS with an Audio Interface on Windows for streaming to send to Zoom
That aside, you may also find that in the long run you want more from your DAW (Digital Audio Workstation) than Audacity can offer. Given your background in producing the voice-overs and the recordings you’ve already shared, I expect you’ll be wanting to do more with mixing and music production in due course. There are a number of free DAWs and then, not free but at $60 incredible value, is Reaper that many here (including myself) use, apart from anything else it has the plus of a top drawer catalog of tutorial videos on their webpage.
Look forward to your next production (maybe I will still find it as I check in this morning)