Unable to join a Teams channel due to Microsoft Authenticator verification issue

Question

Unable to join a Teams channel due to Microsoft Authenticator verification issue

Sean Bishop 20

I have been requested to join a team channel as a personal user, but I am unable to complete the second stage of the verification process.

The system prompts me to approve the sign-in request via Microsoft Authenticator app; however, no approval notification appears on my device. I suspect my Microsoft account may still be linked to an Authenticator app that was installed on a previous work phone, which I no longer have access to.

To try and resolve the issue, I have reinstalled and reconfigured the Microsoft Authenticator app on my current phone, but the problem persists.

When I select "I can't use my Microsoft Authenticator app right now", the only alternative option presented is "Use a verification code." However, the system requests a 6-digit verification code, while the Authenticator app only provides an 8-digit one-time password code. As a result, I am unable to complete the verification process.

I have already contacted Microsoft Support, but they were unable to resolve the issue and advised me to post here for further assistance.

Any guidance on how to regain access or reset the authentication method would be greatly appreciated.

Thank you.

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Answer 1

Anonymous

Hi @Sean Bishop,

Thank you for posting your question in the Microsoft Q&A forum.

Regarding that you can't log in to your account due to Microsoft Authenticator. I’d like to ask a quick questions to better understand your situation and assist you effectively:

Could you please clarify whether you are an end user or an admin?     

If you are an end user I would recommend you contact your account's Admin to reset your MFA settings through the Microsoft Entra Admin Center. Ask your administrator to follow these steps:       

After you have been able to log in to the Microsoft admin center please follow these steps :       

Sign in to Microsoft Entra admin center with the admin account
Go to Users
Select the affected user account
Open Authentication methods
Revoke sessions
Select Require re‑register MFA
Save the changes

Revoke MFA sessions and require re-register in the Microsoft Entra admin center 

User's image

You could provide your admin this article for a better view: Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID |…    

If you’re unsure who the Global Admin is within your organization, you can find guidance on locating them here: How do I find my Microsoft 365 admin? - Microsoft Support.       

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.    

Thank you again for your time and understanding.   

I really appreciate your patience, and I’m here to help. Looking forward to your response!          

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   

Sean Bishop 20 Reputation points

2026-06-15T15:19:32.59+00:00
Hi @Anonymous

Thank you for your response.

To clarify, I am a personal Microsoft account user and not part of any organisation or Microsoft 365 tenant. I therefore do not have an administrator who can access the Microsoft Entra Admin Center or reset my MFA settings.

The issue occurs when I attempt to accept an invitation to join a Microsoft Teams channel as a guest using my personal Microsoft account.

My account is prompting for Microsoft Authenticator approval, but no approval notification appears in the Authenticator app. I suspect the account may still be linked to an old device that I no longer have access to.

When I select "I can't use my Microsoft Authenticator app right now", I am asked for a 6-digit verification code. However, the Authenticator app only provides an 8-digit one-time password code, which is not accepted.

Could you please advise:

How a personal Microsoft account user can reset or remove an old Authenticator registration when they no longer have access to the original device?

Whether there is a self-service recovery process available for personal Microsoft accounts?

Whether this issue should instead be raised with Microsoft Account Support rather than Microsoft Entra / organisational account support?

Any guidance would be greatly appreciated, as I am currently unable to complete the verification process required to access the Teams channel.

Thank you for your assistance.

Kind regards,

Sean Bishop
Anonymous

2026-06-16T14:05:58.47+00:00
Hi @Sean Bishop,

Thank you for the detailed clarification this helps a lot in understanding the root cause.

Based on what you’ve described, your scenario is actually not purely a personal Microsoft account issue.

Even though your account is personal, once you were invited as a guest into a Microsoft Teams channel, your sign-in is now being governed by the security policies (such as Conditional Access and MFA requirements) of the organization that invited you.

When you try to join the Teams channel, you are authenticating against the external tenant (the organization that invited you)

That tenant likely enforces MFA using Microsoft Authenticator

Your account still has an old/invalid Authenticator registration (linked to your previous device)

Since the MFA requirement is controlled by that tenant, your personal account self-service options are limited in this flow

In this situation, you cannot fully reset this yourself as a personal user.

You will need to contact the IT administrator of the organization that invited you to the Teams channel and ask them to:

Reset your MFA methods

Require you to re-register MFA

Revoke your existing authentication sessions

These are admin actions typically performed in Microsoft Entra, where admins can require users to re-register MFA and revoke sessions

I hope this clarifies why the issue is occurring and points you in the right direction.

If I’ve misunderstood any part of your scenario, please feel free to let me know and I’d be happy to refine the guidance further.
Sean Bishop 20 Reputation points

2026-06-19T06:29:40.6133333+00:00

@Anonymous that has solved the issue. Thanks so much. Sean
Anonymous

2026-06-19T07:41:26.21+00:00

Hi @Sean Bishop,

I’m really glad to hear that the issue is no longer affecting your work! Please don’t hesitate to reach out anytime you need support. I’m always here to help.

If the answer is helpful, click "Accept Answer" and politely vote yes. As other users will also search information in this community, your valuable vote will definitely also help other users who have similar queries easily to find the correct channel and useful information more quickly.

Take care, and have a great day ahead!