two-factor authentication

If you newly created a an M365 tenant, this is what you’ll be forced to by to enter authentication methods in this Security Defaults feature –

In most cases, even clicking on Skip for now option doesn’t help and I’m forced to enter an alternate authentication method.
Ideally, for Production purposes, you should keep this turned on. Only if you are on a trial and the tenant you are working on is for learning purposes, it is OK to turn this off.

Turn Off Security Defaults in Azure Portal

Here’s how you can turn off the Security Defaults requirement from the Azure Portal –

Navigate to Azure Portal (https://portal.azure.com)
Again, you’ll see this message so you can choose to skip this since we want to disable the Security Defaults.
Then, go to Azure Active Directory
Once in Azure Active Directory, look for the Settings in the left hand pane.
In Properties, at the bottom you’ll see the Manage Security defaults button.
It would be turned on by default (Yes) which you’ll need to switch to No.
Once you switch to No, you’ll need to select either of the below reasons as to why you are switching it off. I just entered N/A in the Others reason, your reason could be different.
Once you Save it, that’s all. Now you can just close the Window and try to Login again.

Logging in without Security Defaults

When the Security Defaults is turned off, you can see that the login screen will no longer ask you to enter an authentication method –

When you enter password.
And when you sign in, you’re no longer asked to enter a method for authentication and you’re already logged in past that step.