Dear Gerard,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
Based on your description, I understand that you have a query "Disable MFA for tenant".
Have you tried disabling the MFA for all organization by disabling the security defaults? Sign in to the Microsoft Entra admin center > Browse to Microsoft Entra ID (Azure AD) > Properties > Select Manage security defaults > Set Security defaults to disabled > Select Save. Refer to Providing a default level of security in Azure Active Directory - Microsoft Entra | Microsoft Learn.
Please note that disabling MFA for the whole tenant is not recommended for security reasons. It is better to disable it on a user basis if it is not practical for your organization at the moment.
To disable MFA for a user, Sign in to the Azure portal with your admin credentials > Go to Azure Active Directory > Select Users > Select the user you want to disable MFA for > Select Authentication methods > Under MFA, select Disable > Select Save.
We look forward to hearing from you; Please note that our initial response does not always resolve the issue right away. However, with your help and more detailed information, we can work together to find a solution. Thank you for your help.
Sincerely
De Paul | Microsoft Community Moderator