What input did you do to general QBI? It is not just automatic. 

The online directions from Intuit state: "For each activity, click on the Qual. Bus. Inc. Deduction section along the top of your screen." However, there is no required input apart from checking the SSTB box. What am I missing?

If I change the filing status from Surviving Spouse to MFJ, the QBI deduction shows up. That means the software does not allow the deduction for a surviving spouse, which does not make sense.

I don't know ProConnect (or Lacerte) but I'm wondering if you have something coded as Spouse instead of Taxpayer?

I checked theTaxBook (Sect. 8, Business Deductions). Apparently Surviving Spouse is treated the same as Single or MFS when it comes to the QBI phaseout limits. I had assumed, apparently in error, that it would be treated identically as MFJ. I welcome any further clarification of the regulations.

P.S. I had a typo in the original question. The QBID form is 8995, 8895.