Global Admin - MFA Re-Register Failed with New Phone Transfer - Locked out of 365 Admin Center

Question

Global Admin - MFA Re-Register Failed with New Phone Transfer - Locked out of 365 Admin Center

Matthew Benedetti 0

Good Morning,

I am in a dire situation regarding my inability to access the admin center and manage my clients and partners. I transferred to a new mobile device last Friday and while doing so, performed the MFA require re-registering of MFA on my user. It unfortunately did not take as when I attempt to login, I receive MFA prompts instead of it initiating the MFA setup. When I select the I do not have my authenticator option, the only options I am given are use MFA, or use a code generated by the App. I have no option for sms or alternate email.

As a result, I cannot access my admin center to work with my clients or my partners. This is a disaster of my own making for sure, but I absolutely initiated the MFA reset.

My old device failed, and is not accessible, which was the reason for the move to a new one.

I have created a case, and emailed a response back, but I am incredibly anxious with the uncertainty with not being able to call and get a live person. Calling in refers me only to email back with updated information, which I did this morning asking when I should expect a call back.

Here is the Case ID:

[Moderator note: personal info removed]

Here are screenshots of the prompts I receive that confirm I am stuck in a loop with no alternate method of getting in. The bottom line is I just need my MFA status reset to requiring registration again.

User's image

Matthew Benedetti 0 Reputation points

2026-08-10T19:22:01.1733333+00:00

One additional technical detail that may be relevant:

When I selected Require re-register MFA in Microsoft Entra, the operation returned an error related to the OATH/authentication token and did not appear to complete successfully. I attempted the operation both before and after revoking my existing sessions, and received the error.

The session revocation did successfully complete. As a result, I now have no valid authenticated sessions, while the previous Microsoft Authenticator registration appears to remain associated with my account.

I am the sole Global Administrator. There is no alternate Global Administrator, Privileged Authentication Administrator, service principal, or existing authenticated session available to perform the authentication-method reset.

This is now causing active production impact. I am unable to perform time-sensitive SharePoint administration, user provisioning, license assignment, and security/encryption-related changes for clients.

My existing Microsoft support case is referenced above. I would greatly appreciate any assistance confirming that the case has been routed/escalated to the appropriate tenant recovery team.

1 answer

Your answer

Matthew Benedetti 0 Reputation points

2026-08-10T19:22:01.1733333+00:00

One additional technical detail that may be relevant:

When I selected Require re-register MFA in Microsoft Entra, the operation returned an error related to the OATH/authentication token and did not appear to complete successfully. I attempted the operation both before and after revoking my existing sessions, and received the error.

The session revocation did successfully complete. As a result, I now have no valid authenticated sessions, while the previous Microsoft Authenticator registration appears to remain associated with my account.

I am the sole Global Administrator. There is no alternate Global Administrator, Privileged Authentication Administrator, service principal, or existing authenticated session available to perform the authentication-method reset.

This is now causing active production impact. I am unable to perform time-sensitive SharePoint administration, user provisioning, license assignment, and security/encryption-related changes for clients.

My existing Microsoft support case is referenced above. I would greatly appreciate any assistance confirming that the case has been routed/escalated to the appropriate tenant recovery team.

Answer 1

Hendrix 990 Independent Advisor

Hi Matthew,

Based on my experience, if you have successfully created a Microsoft support ticket, may I ask whether you have received an email from a Microsoft Support engineer? If you have received an introductory email from the assigned support engineer, please reply to that email and provide any valid information that can help verify your ownership of the tenant.

Examples of supporting information include:

Tenant ID
Email address(es) of the Global Administrator (GA) account(s)
Invoice ID or proof of purchase
DNS ownership verification (for example, confirmation that you own and manage the custom domain associated with the tenant)
Any other relevant subscription, billing, or account ownership information

Providing this information will help the support engineer and the Data Protection Team (DPT) validate your ownership more efficiently and may expedite the review and account recovery process. Please ensure that all information provided is accurate and directly related to the affected tenant.

For this situation, please actively engage with the support agent, as this is a user-to-user forum, and I don't have access to your environment or Microsoft's backend systems. Issues such as account recovery can only be addressed by Microsoft's dedicated Data Protection Team.

Thank you for your understanding, and I hope your issue gets resolved soon.

If the answer is helpful, please click "Yes" and kindly upvote it. If you have any questions, please click "Comments"

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

Matthew Benedetti 0 Reputation points

2026-08-10T21:32:18.8+00:00

Hi There,

Thank you for getting back to me. So far, I have received an email from a support engineer that only was attempting to setup my availability for a call back. I am going to reply to the email with all of the identifying information you suggested in your answer above, in the hopes that it might help expedite confirmation and resolution.

Thank you for the advice!
Hendrix 990 Reputation points Independent Advisor

2026-08-10T22:17:24.1233333+00:00

Hi Matthew,

Greatly appreciate your response.

I'm very happy to be able to help you out in some way. I hope your ticket would proceed smoothly and you can regain access to your account as soon as possible.

If you have any concerns or questions in the future, please don’t hesitate to reach out. Not only will I be happy to assist you, but all moderators and users in the Q&A forum will also do their best to provide support and guidance.

Wishing you a wonderful day ahead.
Matthew Benedetti 0 Reputation points

2026-08-10T22:21:05.7933333+00:00

Thank you Hendrix, I really appreciate it... I have seen some of the horror stories in terms of duration before recovery occurs... and this is a really bad impact to business continuity to say the least... 100% my fault... Even though I reset registration, I have ample opportunity to test to confirm before revoking all sessions. I didnt do that. At any rate... I have a significant amount of dread trying to estimate if I am down days or weeks before I can help my clients our and allow my team members to function properly.
Thank you again for your advice, I sent a lot of information to them in that thread to help demonstrate control and ownership.
Hendrix 990 Reputation points Independent Advisor

2026-08-10T23:57:12.4633333+00:00

Hi Matthew,

I'm sorry for the troubles this issue may have caused you. I also truly understand how frustrated it is when there is nothing can be done to quickly resolve the issue by yourself to recover the workflow as soon as possible.

That said, it's good to hear some positive news now that your case has been assigned to a support agent and he/she will help you to recover your account with your supporting information. Hopefully you will remain patient a little longer and I also hope that your issue can be resolved as soon as possible.

If you found the answer helpful, please kindly upvote it.

Many best wishes to you for a wonderful day.