How do I get support with Authentication when it doesn't work?

• At the sign-in prompt, select Other ways to sign in and use SMS, email, or another registered method if available. The “Microsoft Entra ID” tile may be an inactive single sign-on entry and not a code generator. 
• If no alternative method works, another Microsoft 365 administrator must reset your authentication methods. If you are the only administrator, contact Microsoft 365 Business phone support using the country or region number listed on Microsoft’s support page. Phone support includes verification using the email address or phone number registered in your organization profile.
• Do not delete or reinstall Authenticator before access is recovered, because this may remove any remaining credentials.
• After Microsoft restores access, register Authenticator again, add at least one backup sign-in method, then update the billing address and payment method in the Microsoft 365 admin center. The billing address should match the card provider’s records.

Hi,

You are in the wrong forum here, because this one is about the database management system Microsoft Access. You could post your authentication question in the Microsoft Q&A forums. They have tags for Authenticator 

https://learn.microsoft.com/en-us/answers/tags/792/microsoft-security-microsoft-authenticator

or several for subscription questions, like

https://learn.microsoft.com/en-us/answers/tags/1231/m365-office-subscription-account-billing-home-platform-windows

Servus
Karl
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Access Forever News DevCon
Access-Entwickler-Konferenz AEK

If someone from Microsoft could contact me I'd be happy to restart my Business 365 subscription.  You just need to tell me how to get past authentication and update my address.