Hi @milly yates
Thank you for posting your question in the Microsoft Q&A forum.
Since you're not receiving notifications and there’s no place to enter the verification code, it might be worth resetting your multi-factor authentication (MFA) setup to re-establish a proper connection.
If your account is a work or school account, the best solution is to contact your organization's IT support team or administrator. They can assist in resetting your multi-factor authentication settings and guide you through re-registering your account on the new phone.
May I know if you know any Global Administrators in your organization who could help with this process?
If yes, please ask them to follow this article to proceed to reset your 2FA so that you could re-register again: Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID | Microsoft Learn
If no, then you are the only Global Administrator and you are completely locked out from the tenant. You might need to contact us via phone service number: Customer service phone numbers - Microsoft Support. The agent will be able to create a ticket for you under the affected tenant and then transfer this ticket to DataProtection team who could help you to regain access.
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