How do I remove an email address associated with my iCloud account that I didn’t authorize?

Yeah sounds like a hide my email address iCloud has set up, more info here:

https://support.apple.com/en-gb/HT210425

If you log into your Apple ID you can access your associated emails by clicking on the "Edit" button next to your account info.

screenshot of account info

From there you'll see all the email addresses associated with your Apple ID. You can delete them or add new ones here.

screenshot of account details - email address

Delete additional emails by clicking on the 'X' next to it

Hi kerra130

What might have happened is something I did myself by accident when I was prompted to create a secret email address and is very simple to fix;

Login to your icloud account and go to the settings page

https://www.icloud.com/settings/

click on the manage link under 'hide my email'

From here you should be able to remove the unwanted email address.

To delete an email address from your account checkout this article https://support.apple.com/en-us/HT201356

Is an email address you recognise or does it seem to be randomly generated