Fix Office 365 Student SMS Verification Code Not Received

Ensure the phone number you entered is a physical mobile phone number registered with a standard cellular carrier, not a VoIP service.

Open your phone's SMS application settings and review your blocked numbers list. Ensure that messages from unknown senders or automated shortcodes are allowed.

Check your 'Junk', 'Spam', or 'Filtered' message folders in your SMS app, as aggressive spam filters may mistakenly categorize the Microsoft code as spam.

On the Office 365 login screen where it asks for the code, click the link that says 'Sign in another way' or 'I didn't get a code'.

Select another registered method from the list, such as receiving a code via an alternative email address, receiving a phone call, or using the Microsoft Authenticator app.

Once logged in, navigate to your Microsoft account Security settings to update your phone number or add an authenticator app to prevent future lockouts.

Contact your school's helpdesk, IT administrator, or student support services via email or phone.

Explain that you are not receiving SMS verification codes and request them to 'Require re-register MFA' for your account.

Once the administrator clears your settings, log in to your Office 365 account again. You will be prompted to set up your security information from scratch.