A further update - the correct Nondeductible IRA data for both taxpayers is still showing on the IRA Info Wks form.  I just need Turbotax to recognize it and create both 8606 forms.

You may need to enter Forms mode in order to create the second 8606.  

Here's how to switch to forms mode for Windows 

Here's how to switch to forms mode for Mac

If this does not work then we suggest deleting the 8606 forms and starting again (not in Forms mode).  

How do I view and delete forms in TurboTax Online?

• Open or continue your return in TurboTax.
• In the left menu, select Tax Tools and then Tools.
• In the pop-up window Tool Center, choose Delete a form.
• Select Delete next to the form/schedule/worksheet in the list and follow the instructions.

The answer seemed to be that the taxable IRA withdrawal for me (spouse) was from an Inherited IRA.  For my husband (taxpayer), the taxable IRA withdrawal was an ordinary distribution.  I finally figured it out by switching the box 7 code from 4 (death) to 7 (Normal distribution).  It was the only difference I could determine about our 1099-Rs.  So apparently even though the IRS considers the withdrawal from and Inherited IRA to be taxable to me, it doesn't consider the asset value of the Inherited IRA to be part of my basis, and thus Turbotax decided there was no reason to create an 8606-S.  I hope Turbotax might add some verbiage to explain this nuance someday, as I spent hours and hours trying to figure it out.

Anyway, my problem is resolved.