If there are any issues with accessing network services, you may encounter some issues like IPv6 no network access, cannot sign into iCloud, and so forth. After that, you can try updating iCloud for Windows again and check if the issue “cant sign into iCloud” still persists. Go to the Advanced tab in the Internet Properties window, scroll down the page to the Security section, and then uncheck the box next to Do not save encrypted pages to disk. Click on Internet Options from the pop-up window. Change the View by type to Category and click on the Network and Internet section. Type control in the search box and then select the Control Panel app from the Best match. If your iCloud for Windows can’t update to the latest, follow the steps below: In addition, you need to install the latest iCloud for Windows version. If your PC meets these requirements but still can’t sign into iCloud, you can move next to the following solutions. Firefox 45 or later version, Google Chrome 54 or later (desktop mode only), Microsoft Edge, or Opera.Tip: Click here to check your Windows 10 system information.