Have unknown email and phone number attached to my email

Question

Have unknown email and phone number attached to my email

ROBIN ROTHSCHILD 0

I have an unknown email ending with bigpond.com and phone number ending with 80 attached to my msn.com email. I have screenshot Need someone to help me with this Serios issue

Hornblower409 14,690 Reputation points

2026-09-08T00:32:39.67+00:00

If the AI Answer did not solve your problem, type "Not Solved" in the "Add Comment" box below and then click the [Add Comment] button. I will try to offer some suggestions on what you can do next.

2 answers

Your answer

Hornblower409 14,690 Reputation points

2026-09-08T00:32:39.67+00:00

If the AI Answer did not solve your problem, type "Not Solved" in the "Add Comment" box below and then click the [Add Comment] button. I will try to offer some suggestions on what you can do next.

Answer 1

Thomas4-N 21,535 Microsoft External Staff Moderator

Hello ROBIN ROTHSCHILD,

I understand why these unknown details are concerning.

Where exactly do the unknown email address and phone number appear: under Your info, Security > Manage how I sign in, or a security info change is pending message? Also, can you still sign in and receive a verification code through any method you recognize?

In the meantime:

Review Recent activity and mark any unfamiliar activity as This wasn’t me.
Change the account password.
Under Security > Manage how I sign in, add a trusted verification method and remove any method you do not recognize.
If you cannot verify the account because only the unknown details are offered, use the Microsoft Sign-in Helper.

Please do not post the full email address, phone number, password, or verification codes here. Microsoft Q&A is a public community forum, so contributors cannot access or modify account information.

Thomas4-N 21,535 Reputation points Microsoft External Staff Moderator

2026-09-10T15:02:18.8733333+00:00

Hello ROBIN ROTHSCHILD,

Just check in to see how things are going. Let me know if you need anything.

Answer 2

This can indicate either a compromised Microsoft account or changed security information. Take these steps immediately:

Check recent account activity at https://account.live.com/activity.
- Review sign-ins and security challenges.
- Mark any unfamiliar activity as This wasn’t me.
Review the email addresses attached to the Microsoft account.
- Go to Edit account info at https://account.live.com/names/manage.
- Remove any unknown email address if possible.
- If an address is listed but unverified, use Verify only for addresses that belong to the account owner.
Check sign-in and recovery methods.
- Open the Microsoft account area used to manage sign-in methods.
- Remove any unknown recovery email address or phone number.
- Add trusted security information so account recovery remains possible.
Restrict sign-in aliases.
- Sign in to account.microsoft.com and go to Your info > Sign-in preferences.
- Allow sign-in only for trusted aliases and save the change.
If Outlook.com mail is also affected, inspect mailbox settings.
- In Outlook.com, check Settings > Mail > Forwarding and disable any forwarding that was not added intentionally.
- Check Settings > Mail > Rules and remove unfamiliar rules, especially rules that forward, redirect, move, or delete messages.
- Review Sent Items, Deleted Items, Junk Email, Archive, blocked senders, and automatic replies.
If sign-in is blocked or the unknown security info cannot be removed, use the Microsoft sign-in helper or contact support.
- Sign-in issues can be diagnosed with the Sign-in helper.
- Support can be reached through Contact Microsoft Support.
- Support agents cannot send password reset links or directly change account details.

If a verification prompt shows only unknown contact details, the accepted recovery path is to choose I don’t have any of these and complete the account recovery process.