How to look up your Private Relay Apple ID email address

Learn more about Hide My Email and iCloud+ --> How to use Hide My Email with iCloud+ on your iPhone or iPad - Apple Support

"Hide My Email is a service that's included with your iCloud+ subscription. With Hide My Email, you can generate unique, random email addresses that automatically forward to your personal inbox, so you can keep your email address private." "You can create as many email addresses as you need."