Don't trust the Maryland Two-Income Subtraction determination right now (May 15th 7:30PM ET)
But when I go through the appropriate TurboTax Maryland section, it tells me, "At this point, you don't qualify for the two-income subtraction. Both <husband> and <wife> must have taxable income to qualify." We do have it!
The W-2s are correct. There are no other subtractions that would eliminate either taxable income.
Meanwhile, processing this on the MD State Comptroller website auto-grants this subtractions based on the same data.
This is a TurboTax bug. But TT currently doesn't have an obvious feedback/report-a-bug button, so I have to notify them/you in the form of "posting a question."
Maryland filers who are filing just in time now should keep an eye on this and don't just trust it in TT until it's fixed.