How do I create an app password to access my email?
How do I create an app password to access my icloud email?
Question marked as
See the instructions in Using app-specific passwords - Apple Support
Note that it is only necessary if you are using a 3rd party app for your iCloud email.
Also note that you will first need to turn on two-factor authentication if it is not already on: Two-factor authentication for Apple ID - Apple Support