Is this preventing you from being able to e-file? May I ask are you able to move past it without entering anything?
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Response to TiffanyL: Thanks for your response. This turned out not to be a problem, although at the time I posted the question it appeared it might be. I was in the "final check" section (I forget what it's called), and the system flagged my phone number as a needed item; I knew from Tools/View Tax Summary that it already had the e-mail address. I ignored the request, clicked "Continue", and reviewed other entries. When the system came back to this point, the request was still insistently there. Since I thought it might create some problem with completing the return (as you know, it isn't possible to see the actual return until it's finished and paid for), I decided to provide the number. After I paid for the return, I was able to see that neither the phone number nor the e-mail address had been entered in the Form 1040 "Sign Here" section. I don't believe in providing information the IRS doesn't require, and I know the IRS doesn't initiate taxpayer contacts via phone or e-mail. So I don't think Turbo Tax should demand phone or e-mail information while compiling the return. Once again, thanks for your reply.