Microsoft has been requiring you to use their stupid and fake security app called “Microsoft Authentication”. Just like all 2FA (two Factor Authentication) it is flawed in numerous ways and only provides the illusion of security, not real security.
If you haven’t turned it on or want to stop using it and you have a Microsoft business account, especially a 365 or Exchange account, just follow these simple steps.
Go to your Azure portal, not the normal portal. This link should take you there.
https://portal.azure.com/#view/Microsoft_AAD_IAM/ActiveDirectoryMenuBlade/~/Properties
Now sign in with your business administrator account.
Go to “Manage Security defaults” at bottom of main window.

Select “disable…” from the drop down.

Save and back out.
That’s all there is to it.
Until we meet again, have a virus free week.