Cannot Import 1099 from Vanguard

I have successfully imported my 1099 from Vanguard in the past. However, this year Turbotax is telling me the sign in is invalid. I have tried several times, carefully entering my ID and PW. I'm guessing there might be a problem with Vanguard's new security feature where they text a security code to your phone and ask you to input it to complete your login.  Is anyone else having the same problem?