How to Fix Microsoft Phone Verification Failing When Changing Sign-In Methods
Question details
Users are unable to receive SMS text messages or voice calls for multi-factor authentication (MFA) when attempting to change their Microsoft sign-in methods, despite normal carrier service.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Updating multi-factor authentication (MFA) methods for a Microsoft work or school account.
- Observed behavior
- Verification codes are not delivered via text or call, suggesting a potential block on the specific phone number or SIM card by Microsoft's backend security systems.
Ensure your mobile phone has a strong cellular signal and that you have not accidentally blocked shortcode messages. If you are using a work or school account, have your organization's IT helpdesk contact information ready before proceeding.
Request Assistance from Your Global Administrator
Since community moderators and standard users cannot investigate backend verification blocks, your organization's IT administrator must escalate the issue to Microsoft directly.
Microsoft's security systems will occasionally flag and block specific phone numbers or SIM cards from receiving MFA codes. Standard users do not have the authorization to lift these restrictions.
Locate the contact information for your company or school's IT department or Global Administrator.
Ask the administrator to log into the Microsoft 365 Admin Center with their administrative credentials.
Instruct the admin to navigate to Support > New service request > Contact Support in the left-hand menu to open a ticket regarding the MFA block on your phone number.
Use an Alternate Verification Method
Bypass the phone number block temporarily by using an alternative authentication method such as the Microsoft Authenticator app.
Keep Working on Your Documents Even When Locked Out of Microsoft 365
If you are temporarily locked out of your Microsoft 365 account due to MFA phone verification failures, you don't have to stop working. WPS Office is a free, lightweight alternative that lets you edit your local documents without needing a cloud login.
- 1. Download the Software: Visit the official WPS Office website and download the free installer for your operating system.
- 2. Open Local Documents: Launch WPS Office and click 'Open' to select your existing .docx, .xlsx, or .pptx files directly from your computer's hard drive.
- 3. Edit and Save: Edit your documents seamlessly and save them in their original Microsoft formats, ensuring your work remains uninterrupted.
Frequently Asked Questions
Why is Microsoft not sending the verification code to my phone?
Microsoft's automated security systems may temporarily block a phone number if multiple verification attempts fail or if it detects suspicious activity. Additionally, local network carrier issues with delivering automated shortcodes can prevent the texts from arriving.
Can I bypass phone verification if I am locked out of Microsoft 365?
You can only bypass phone verification if you have previously set up alternate authentication methods, such as an authenticator app or a secondary email address. Otherwise, an IT admin must intervene to reset your MFA settings.
How long does a Microsoft MFA verification block last?
Temporary verification blocks typically lift automatically after 24 hours. However, if the system permanently flags the number or SIM card, your organization's Global Administrator will need to open a Microsoft support ticket to manually remove the restriction.
