Email for Codes is partly removed?

You should contact xbox support directly. They are the only ones how can look into account issues. http://support.xbox.com/en-US/contact-us

What Mistress Sara Said is partly correct.

What you are wanting to do is not possible since the @live.com account is already a Microsoft account if you remove it from the current xbox profile it will delete that email and you will lose it FOREVER. (you will not be able to sign back into it.) And
once it is gone there is NOTHING anyone can do to get it back.

so DO NOT remove your @live.com email from that account after adding a new email to it. unless you do not care about losing that email address.

well they partly anticapated it. you couldn't add codes on your smart phones.

Family was removed partly because the Xbox One will have the new home gold feature, which is even better than family gold.

Tommy, I managed to partly re-access the old account. I say "partly" because when I enter the one-time code, I'm brought back to the sign-in page. When I select the new account (which evidently doesn't have a password), a code is generated and I'm taken back to the code entry page. How do I break out of the loop and access the new account (and create a password in the process)?

Thanks.