Home Forums Networks & Cross-Platform Networking iCloud being a pain in the butt

Unless one has a legacy ID, from many years ago, one's Apple ID is used for all Apple Services (iCloud, iTunes, App Store, Mac App Store, Apple Account) regardless of whether access is from iOS devices or macOS desktop.

If one goes to Apple ID - Manage your Apple Account ( Link ) and views the ID Section for the account, it will show the ID primarily associated with the Account and which is best used for all Apple Services login. If one has a legacy Alias associated with their Account, it's linked to the Primary ID. IMHO, it's best to solely use the Primary ID in order to alleviate log-in confusion when signing into Apple / iCloud services from various devices.

By the way, if one want's to Change their Apple ID, one can do so at this Manage ID login. This can also be done from an iOS device, running iOS 10.3.1, in Settings; however, I think it's a bit easier doing this task logged into one's Account via the above Link.

Here's Apple's FAQ page on Apple ID . It clearly shows there's 1 email address, which is one's Apple ID, associated with the Account and used across all Apple Services.