Workaround for “Cannot sign in to iCloud.” error message when
trying to Sign In to the “iCloud for Windows” app.
Uninstall the “iCloud for Windows“ app. [Start/Settings/Apps]
Download the “iCloud for Windows” installation program from the Apple website.
Go to the Apple.com website.
Search the Apple.com website for the web page “Download iCloud for
Windows” .
The web page is located at the URL: on https://support.apple.com/en-us/HT204283
Scroll down on the web page to the section “Here’s what you need”
Click on the link on the line “On the line “On Windows 7 and Windows 8,
you can “download iCloud for Windows on Apple’s website.” to download the “iCloud
for Windows” installation program.
Note: You will need to use an User Account that has Administrator privileges to install the iCloud for Windows app and enable the Media Features for Windows (aka. Windows Media Player).
Before installing the “iCloud for Windows” app you will need to make sure that the Media Features for Windows is enabled.
See the article:
How to Fix the iCloud Missing Media Features Error on Windows 10.
[ https://www.guidingtech.com/fix-icloud-missing-media-features-error-windows-10/ ]
Here is a summary of the instructions from that web page:
Open a Run dialog box by simultaneously pressing the Windows-key and the “R” key.
In the Open dialog box type optionalfeatures.exe and press the Enter key.
On the Windows Features dialog box scroll down and make sure there is a check in the checkbox beside Media Features.
Press the “OK” button.
Now run the iCloudSetup.exe installer program that you downloaded from Apple.com to install the “iCloud for Windows” app.
You will need to restart Windows 10 to complete the installation of “iCloud for Windows” app.
Good luck.