Signout in old device

Question

I cannot log in to Microsoft attention because I logged into another device but currently I no longer use that device I have switched to a new one thanks to your assistance logging out on the old device so I can log in for two steps on the new device.

Answer 1

Please understand that as forum moderators, we do not have the tools or sufficient access to make changes to user accounts, including logging in, resetting passwords, or modifying access rights. For your security, only Microsoft Support can assist with these requests. However, I will do my best to guide you using publicly available documentation, research, and community experience.  

Hello @Hien Nguyen Thai (RB-TGG),

Welcome to Microsoft Q&A Forum!  

To better understand your situation and guide you correctly, could you please confirm whether you are an end user or a global administrator of your Microsoft 365 tenant?  

The next steps will depend on your role:  

1. If you are an end user  

The fastest and most effective solution is to contact your company’s IT administrator. They have the necessary tools in the Microsoft Entra/Azure admin center to reset your Multi‑Factor Authentication (MFA) settings, remove the old device from your account, and allow you to set up Authenticator on your new phone immediately. 

You may share this official Microsoft article with them for detailed guidance: Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID |…    

2. If you are an administrator  

Please check whether there is another admin in your tenant. If so, they can reset your MFA configuration by:  

• Signing in to the Microsoft Entra Admin Center  
• Navigating to Users > Your Account > Authentication methods  
• Selecting Require re‑register MFA  

You will then be prompted to set up MFA again at your next login.  

3. If you are the only administrator  

In this case, you will need to contact Microsoft’s Data Protection team, who are authorized to verify your identity and reset MFA settings. Please call Microsoft Support using the appropriate regional hotline listed here: Customer service phone numbers - Microsoft Support  

(When you call the support number, you may hear an introduction of about 30 seconds such as "you can visit the link...". You can ignore this introduction and wait until you are presented with the options. Then press "1" as a business email user, and again "1" for technical help.)     

Could you please confirm which of the three cases applies to you? Once I have this information, I can guide you further and ensure you get the correct next steps. Or if you need any help explaining this to your IT team, please feel free to let me know. 

Thank you and I look forward to your reply. 

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