In versions from 2019R1 it is shipped as a paid function, so customer has to pay for the security. I recommend Acumatica marketing department to review and make this free of charge feature.
Everyone offers and encourages to use 2FA - Amazon, Microsoft, all the banks and even GitHub. And all offer it for free, simply because when Acumatica sells it, as a paid option - Acumatica's message is - Dear Customers, your software you bought from Acumatica is not secure. If you want to have a secure option, you can buy it from use for an extra fee.
Suggest to rethink your marketing very well as the message is exactly like above. Would it be third party selling 2FA for Acumatica - I would understand, but not the main software vendor.