G'day Applesandbananas2121,
We'd like to clarify what's happening to see how we can assist. Are you talking about removing a "Reachable At" address from your Apple ID? If so, you should be able to do so with the steps below: About your Apple ID email addresses - Apple Support
"Delete an additional email address
- Sign in to appleid.apple.com.
- Select Personal Information, then select Reachable At.
- To delete one of your additional email addresses, click the Remove button
next to the address."
Make sure those are the steps you're following if you are indeed trying to remove an alternate address from your Apple ID. If something else is happening, please fill us in on the details.
Take care.