Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Dear @Sam Thompson,
I hope you’re having a good day.
I’m sorry to hear you’re having trouble signing in after changing your phone. When you replace your device, Microsoft Authenticator does not automatically transfer MFA settings unless you previously enabled cloud backup and restored it on the new phone.
If you're using a work or school account, please note that MFA settings are typically managed by your organization's IT administrator. In this case, I recommend contacting your admin to verify your MFA configuration or reset your authentication methods.
Your administrator can follow the guidance in the following article: Manage authentication methods for Microsoft Entra multi-factor authentication
If you’re unsure who your administrator is, this article may help: How do I find my Microsoft 365 admin?
I hope this information helps point you in the right direction. If you run into any issues while trying the steps, or if something still doesn’t feel quite right, please don’t hesitate to reach out again. I’ll do my best to support you however I can.
Looking forward to hearing back from you with any updates or additional details.
Warm regards,
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