Unable to remove or add another email on my iCloud email alias

First: Secure Your iCloud Account

If you suspect someone else is accessing your alias, it’s critical to do this before anything else:

1. Change your Apple ID password:

• • Go to https://appleid.apple.com
  • Sign in and click "Sign-In and Security" → Password
  • Change it to something new and strong

1. Review your devices:

• • Still on the Apple ID site, scroll down to "Devices"
  • Remove any devices you don’t recognize

1. Enable Two-Factor Authentication (if not already enabled):

• • In Settings (iOS) or System Settings (Mac) → Your Name → Password & Security → Turn on 2FA

Then: Remove or Disable the iCloud Email Alias

An email alias is like a nickname for your iCloud email. If someone else is using it, you can delete or disable it this way:

How to Remove an iCloud Email Alias

1. Go to iCloud Mail on the Web:

• • Visit https://www.icloud.com/mail
  • Log in with your Apple ID

1. Open Preferences:

• • Click the gear icon ⚙️ in the lower-left corner
  • Choose "Preferences"

1. Go to Accounts Tab:

• • You’ll see your main address and any aliases listed

1. Disable or Delete Alias:

• • To disable, uncheck “Enable this alias” — this stops it from receiving or sending mail
• To delete it permanently, click “Delete” next to the alias

⚠️ You can’t reuse or recreate a deleted alias, and neither can anyone else

1. Click Done to save changes.