It's possible that you initially signed up with Apple and opted to Hide my email when prompted to share your email address. In such cases, Apple generates a private relay email address for you and it will look similar to abcd1234@privaterelay.appleid.com.
On your iPhone or iPad:
If you have iCloud+, follow these steps:
Open Settings.
Tap your Apple ID name at the top.
Tap Sign in with Apple.
Select Hallow.
You’ll see:
The relay email address Apple created (ending in @privaterelay.appleid.com).
Whether forwarding is turned on.
If you do not have iCloud+, follow these steps:
Open your device's Settings.
Choose Sign in with Apple.
Under Apps and Websites, you should see Hallow. Tap on it.
You will see your Apple Account name and Hide my Email.
Tap Manage Hide My Email to make any changes.
On your desktop or laptop:
Sign in to appleid.apple.com.
Go to the Sign in & Security tab.
Click Sign in with Apple.
Click Hallow.
You will see your Relay Email under Hide My Email.
You can manage settings or stop using sign in with Apple for Hallow.
We’re always here to help when you need it. You can reach out through this purple chat window on the bottom-right corner or e-mail us at support@hallow.app
God bless 🕊️