Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello @Chris Ho`,
I'm sorry to hear that you're locked out of Microsoft 365 tenant.
Based on your description, you'll need to revoke your MFA access for the admin account, which will allow you to set up Authenticator on a new device and then you can access Microsoft 365 Admin center to change your payment details.
As you are the only administrator in this tenant, you will need to contact the Microsoft Data Protection team, as they are the only group authorized and equipped with the necessary tools and verification procedures to confirm your identity and restore administrator access.
Please try to find the related hotline number to call the frontline and let them raise a ticket for you (expand region under Business Users): Customer service phone numbers - Microsoft Support
Carefully follow this instruction to ask for Microsoft Data Protection team support:
Depending on your country or region.
For some countries, when calling the support number, although there are about 30 seconds opening as something "you can visit the link...." But you can ignore this opening and wait until the option, then "1" as a business email user, "1" again for technical help.
For some countries, it will be an automated conversation like:
- First, when you call the hotline, it asks what kind of problem you are worried about.
- Answered: authenticator.
- A: What kind of product are you using?
- B: Microsoft 365 for business.
- A confirmation: education or company account?
- B: For companies
- A: Are you an administrator?
- B: Yes.
- A: Do you have the other admin in your organization?
- B: No.
- A: You need one.... Service request?
- B: Yes
If your subscription is from a partner or reseller, contact the reseller's support provider to help open a service request on behalf of you instead.
I’d like to clarify that as a forum moderator, I do not have access to user sign-in logs, cannot reset MFA, revoke access, or contact Microsoft Support on your behalf. Please consider me an end user as well, providing guidance based on experience and documented processes.
If you encounter any difficulties in contacting the frontline support, please feel free to let me know. Thank you and I wish you a great day!
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