I am having issues with icloud syncing to my Windows 10 devices. 2 laptops and a 950 XL. It keeps asking me to put in my password. I have changed my password, deleted the account from Windows 10 and readd it in. Did apple so something?
Same issue here, with a Lumia 650 trying to setup my iCloud account. Also tried removing the account, changing password, creating an account with manual IMAP/SMTP settings. No luck yet.