Sign onto your TurboTax account - https://myturbotax.intuit.com/
Click on Intuit Account at the bottom left of the screen
Click on Sign in & security
If your Phone number is not shown or needs to be changed click on the Phone box
In the box for Phone select Voice call and Continue
If you wish to turn on Two-step verification click on the Two-step verification box
Select Voice call and click on Turn on
