There was a bad iTunes update a few months ago that caused this issue. The solution, if you check the Apple Forums, is to completely remove all Apple software from your computer, reboot, and then reinstall it all. A real pain, I know. I had to do it on my wife's computer, but it solved the problem. There were a LOT of unhappy iTunes customers, sort of like the latest Windows Update this week which has trashed manual Windows Updating, unless you switch your network adapter (iv) to the Google DNS servers (8.8.8.8 and 8.8.4.4.).
Hope this helps. Have a great day.
Regards,
-Phil
Windows 10 Pro x64
Dell XPS 8930
Intel CoreT i7 (4.6 GHz)
32 GB DDR4-2666 RAM
1 TB PCIe -x4 SSD
NVIDIA GeForce RTX 2060
PD14 Ultimate x64, 4207
CD4 Ultra and AD6 Ultra
Bleeping Computer Malware Response Instructor