Call support.
There is no single published number because it changes contently depending on the nature of the call and agent availability. Following the link below will either give a current number for you to call or take your number for a callback.
(Note that phone support is for paying customers only. There is no phone support for Free Customers.)
Here is a TurboTax FAQ for contacting customer support.
https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number
And as a response to this reqyest, i received more online directions that did not solve my problem. Meanwhile Turbotax has essentially stolen $45.00 from me. After using TT for the last 10 years, i will never use them again. BAD CUSTOMERSERVICE! If a problem cannot be solved online, you will waste hours and never get a resolution.