We have multiple iPads and iPhones at my workplace and none of them are popping up in the "preview on device" popup like they used to.
I'm testing on a Windows 10 device that is updated with all updates as of today (28/09). I also have the latest version of iTunes installed, and the devices show up in iTunes where I can see all the info & storage on them.
The only place they don't seem to be appearing is in XD.
I've tried re-installing XD on Windows (which btw is a pain in the ass because I have to manually re-download every plugin individually), re-installing it on the iPads and iPhones, and of course restarted the devices.
Sorry to hear that you are facing difficulties in connecting your devices to XD desktop. We are unable to reproduce this from our end .Could you please provide following information for further analysis
Which version of windows OS ,XD desktop you are on ?
Was this happening with any specific iOS devices, if yes please do mention the device name and its model ?