Office 365: Disable 2FA for Entire Organization

Reference

https://answers.microsoft.com/en-us/msoffice/forum/all/how-can-we-disable-multi-factor-authentication-to/703fffbd-b8d4-4ffd-a8db-c053282265ff

Steps

You may disable security defaults in your directory:

1. Sign in to the Azure portal as a security administrator, Conditional Access administrator, or global administrator.
2. Browse to Azure Active Directory > Properties.
3. Select Manage security defaults.
4. Set Security defaults to Disabled (not recommended).
5. Select Save.