Before I start, I am going to mention that Fidelity does support a 2FA by using Symantec VIP Access to accomplish this. You can follow the instructions here https://www.fidelity.com/security/soft-tokens/overview. This requires you to install an app from Symantec VIP on your computer/phone.
With that out of the way, I am personally not a fan of using Symantec products, nor interested in install a separate third party app to accomplish this when most of us, including myself use some form of OTP/2FA app like Google Authenticator, Authy, 1Password, or what have you.
If you share the same sentiment as I, don't worry I have good news.
Symantec VIP Access actually uses a completely open standard called Time-based One-time Password Algorithm for generating the 6-digit codes that it outputs. The only non-standard part is the provisioning protocol used to create a new token.
In other words, this means that we can use OTP on our favorite app. The question