On Thu, 16 May 2019 12:42:39 +0100
Bill wrote:

OK, I've given up.

It still insists that I log in from an Apple device before I can use
iCloud Photo Sharing in Windows.

As far as I can tell, I've followed all the instructions to the
letter.

It reminds me of when I wanted to join a TomTom forum, so I could
complain about the wrong directions that lorry drivers using the devices
followed, and ended up trying to drive through our living room.
TomTom Forums needed my device serial number to register, but since I
didn't have a TomTom, this was impossible. Another kind of Catch-22
situation.

--
Davey.