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This guide shows any employee how to change the phone number used for Microsoft two‑step verification and how to switch to Microsoft Authenticator (recommended).

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Who this is for

• Anyone whose Microsoft 365 work or school sign‑in still sends 2FA codes to Brian’s number
• Anyone who need to add their own phone and Authenticator app

Quick summary

• Go to your Security info page and add your phone, then remove the old one.[1]
• Add Microsoft Authenticator and set it as your default sign‑in method.[2][3]

Part 1 — Update your 2FA phone number

1. Open the Security info page: https://mysignins.microsoft.com/security-info
2. Sign in with your work or school account.
3. On Security info, select Add sign-in method → Phone.[4]
4. Choose Text or Call, enter your mobile number, and complete the verification.[4]
5. After your new phone is listed, click Change next to Default sign-in method and select Phone (text or call) temporarily.
6. Remove Brian’s number: find the old Phone entry → Delete. If Delete is disabled, contact your IT admin to unlock changes.[5]

Tips

• You can have multiple numbers (primary and alternate). Keep an alternate for backup.[4]
• If the UI looks different, your organization may enforce specific methods; follow what’s offered or contact IT.[5]