THIS WORKED!
My adult daughter who is included on our 1095A had her tax return reject for 8962 2b being blank, which it should be because she has no dependent AGI. Earlier in this thread someone mentioned clicking forms (upper right corner) finding form 8962 and manually changing 8962 question 2b from 'blank to' 0. We did this and within minutes she received confirmation that her return was accepted, so the suggestion appears to have worked.
What is strange however is I check my wife's and my joint return and 8962 2b is also blank. We assumed our return would also be getting rejected, since our adult daughter's income is considered part of the household income for purposes of the marketplace and presumably should have entered here, although we were never prompted to do so via the Q&A when completing the return. We just received confirmation that our return was accepted as well which really doesn't make sense. We did note on the Q&A that a taxpayer not appearing on our return was also on the 1095A and we entered her SSN and percentages when prompted to do. We'll see how it all plays out, but I would suggest the solution I mentioned above.
