From later this year, new registration with Apple addresses, previously published on privaterelay.appleid.comis issued on private.icloud.com. Existing addresses on privaterelay.appleid.com will continue to work and forward mail to users without interruption.
After further consideration and reviewing community feedback, iCloud+ Hide My Email addresses remain open icloud.com.
What you need to do
Developers with apps or websites that use sign-in with Apple should ensure that their account systems, email validation logic, and whitelists accept addresses on the new one. private.icloud.com domain in addition to the existing one privaterelay.appleid.com Domain.
Learn more about signing up with Apple
Communicate with private email Relay service