Probably off topic: How do I find out which Microsoft Office 2016 license is in use on which machine?

Probably off topic, but I can't find an active USENET group for
Microsoft licensing:

How do I find out which Microsoft Office 2016 license is in use on
which machine? I know all my Product Key/machines and I see the
licenses, but not which license is used for which Product Key.

For an unknown reason, Microsoft Office 2016 decided that it needed
to be reactivated. The activation procedure asks you to login to
what turns out is an office.com/myacount account.

It found 3 licenses, but didn't tell me how to figure out which
was the one I used for the machine in the past. I went to the
site in a browser and saw the 3 licenses, but all the page says is
you have a license for this many computers and then tells you how to
install the software.

The web site does not say which of the licenses have how many
machines are using the license (In my case each license is for one
machine and all 3 licenses should already have been in use.)

Microsoft gives directions for finding the Product Key when the
software is activated (in case you lost the label and find in the
future that you need to activate the software again)

However the (re)activation path failed because the license that
I arbitrarily chose had already been used. (Well yes, I'm trying
to re-activate)

Microsoft phone support says I should be able to reinstall and
activate using any one of the 3 licenses, but a) that didn't work,
even though the one I tried was actually the correct one and b)
a Microsoft web page says if you make a DVD you have to use the
correct license since the DVDs will actually be different.

I eventually got the software activated using 1-866-412-7141,
which I had to find by following a path that explained the
"telephone activation is no longer supported" error,
but I still don't see a way to deactivate a license or
determine from the web site that I have license with an available
activation.

Microsoft phone support said the web page was supposed to
have the Product Keys and some information to identify the
machines that were using each Product Key, but they couldn't
help me since I couldn't see the information. (I think that
it is possible that THEY see the information and are supposed to
be able to use the information to set things right, but that the
2 people I spoke to didn't understand what I wanted or didn't
want to help me.)