Not receiving SMS verification code for MFA in Vietnam

Question

Hello Microsoft team,

I am currently completely locked out of my account because I am not receiving the SMS verification code required for Multi-Factor Authentication (MFA).

Here are the specific details of my issue:

Account Type: Work/School account ending in [Moderator note: personal info removed] 

Region: Vietnam (+84).

Issue Description: After entering my password correctly, the system prompts me to verify my identity via a text message sent to my registered phone number. However, the SMS never arrives.

Troubleshooting steps taken: I have tried multiple times over the past few hours/days. My phone has a strong network signal, is not blocking any shortcode numbers, and can receive SMS from other international services normally.

My questions are:

Are there currently any known gateway or telecom delivery issues with sending Microsoft verification SMS to Vietnam?

What are the next steps I can take to regain access to my account? (Note: Please let me know if this requires Global Admin intervention to reset my MFA methods).

Thank you for your support.

Hello Microsoft team,

I am currently completely locked out of my account because I am not receiving the SMS verification code required for Multi-Factor Authentication (MFA).

Here are the specific details of my issue:

Account Type: Work/School account ending in [Moderator note: personal info removed] 

Region: Vietnam (+84).

Issue Description: After entering my password correctly, the system prompts me to verify my identity via a text message sent to my registered phone number. However, the SMS never arrives.

Troubleshooting steps taken: I have tried multiple times over the past few hours/days. My phone has a strong network signal, is not blocking any shortcode numbers, and can receive SMS from other international services normally.

My questions are:

Are there currently any known gateway or telecom delivery issues with sending Microsoft verification SMS to Vietnam?

What are the next steps I can take to regain access to my account? (Note: Please let me know if this requires Global Admin intervention to reset my MFA methods).

Thank you for your support.Hello Microsoft team,

I am currently completely locked out of my account because I am not receiving the SMS verification code required for Multi-Factor Authentication (MFA).

Here are the specific details of my issue:

Account Type: Work/School account ending in [Moderator note: personal info removed] 

Region: Vietnam (+84).

Issue Description: After entering my password correctly, the system prompts me to verify my identity via a text message sent to my registered phone number. However, the SMS never arrives.

Troubleshooting steps taken: I have tried multiple times over the past few hours/days. My phone has a strong network signal, is not blocking any shortcode numbers, and can receive SMS from other international services normally.

My questions are:

Are there currently any known gateway or telecom delivery issues with sending Microsoft verification SMS to Vietnam?

What are the next steps I can take to regain access to my account? (Note: Please let me know if this requires Global Admin intervention to reset my MFA methods).

Thank you for your support.

[Moderator note: personal info removed] 

Answer 1

Hi @Trong Nguyen, 

Thank you for posting your question in the Microsoft Q&A forum. To protect your privacy and ensure the security of your personal information, I’ve removed any sensitive details from your public post and sent you a private message. You can check your private messages by clicking the banner at the top of the page, as shown in the image below.  

Regarding the SMS verification issue you’re experiencing in Vietnam: based on the information currently available, there are no reported Microsoft SMS gateway issues affecting Vietnam (+84) as of March 2026. That said, SMS-based authentication can occasionally run into delivery problems in certain regions. In Vietnam, major telecom providers sometimes delay or filter international or shortcode messages used for verification. Similar issues also occur in other countries from time to time, so you’re not alone in encountering this.  

Please note that forum moderators have no control over user accounts, especially when it comes to logging in to your account, resetting your password, changing your access, etc 

For your specific case, the next step will require assistance from your organization’s Global Administrator. You may kindly ask them to reset your MFA by revoking your existing authentication methods and forcing a fresh re‑registration. This usually takes only a few minutes to complete. They can follow Microsoft’s official guidance here: Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID |… 

Once your admin completes this process, your previous sign-in sessions will be cleared, and the next time you log in, you will be prompted to set up MFA again from scratch. 

If your organization allows it, I highly recommend registering the Microsoft Authenticator app during your next MFA setup. It tends to be far more reliable than SMS, especially in regions where telecom filtering may affect message delivery. 

If you have any further questions or if anything is still unclear, please feel free to reply here. I’m happy to assist you throughout the process.  

Thank you again for reaching out, and I truly hope you’re able to regain access to your account very soon. 

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". 

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.