Managing personal Outlook.com account settings, security, and privacy
@Charity Hall said
I want to change the back up email on my Microsoft account .. but asked for a code that has been sent to my back up email that I don't have access to.
If you don't have any other verification methods defined for your account, there is a way out, but you may loose access to your account for 30 days.
You can try to request that all the verification methods be replaced. This will put your account in a 30 day "Pending Request" state. You will have limited access to the account during this period or no access at all if the account has Two-step Verification enabled.
See the Answer by "Hornblower409 Jun 25 2026" in
https://learn.microsoft.com/en-us/answers/questions/5920985/how-to-fix-we-will-send-a-verification-code-to-(mo