Muti-Factor Authentication (MFA) Login

Muti-Factor Authentication (MFA) Login

Anyone have any feedback on the new MFA login process?  The muti-step process that requires to enter more than a password to login. 

Overall, I applaud this move to safe guard data - especially for us Brokers who manage mutiple accounts. I am wondering if anyone has any thoughts about there not being an option to select e-mail.  Cell phone appears to be the only option.  However,  e-mail option appears to be adopted by other platforms in the industry.  Lastly, have any thoughts about the frequency of having enter an MFA code? 

Looking forward to hearing feedback.