A Microsoft file hosting and synchronization service.
Hello, thank you for reaching out to Microsoft Q&A.
The email address that you’ve added is a security verification email used to confirm your identity.
If this security information is incorrect, please sign in to your Microsoft account on the security settings page to update your information:
https://account.live.com/proofs/Manage
Reference:
If you can sign in successfully on the Security settings page using alternate information, you can update the information there.
However, if you can't log in, you will need to correct the Security information. That is, on the Verify your identity screen, select I don't have any of these and follow the prompts to replace the security information.
Note - If you remove all of your previous security information and replace it with something new, your account will be put into a restricted state for 30 days.