The AMT carryover and QBI carryover are two different things. The program is first trying to decide if you have an AMT capital loss carryover amount. When you say you don't have an AMT form 6251, then TurboTax knows you don't have an AMT carryover, so then it moves on to the issue of a QBI carryover.
So, enter $0 for the QBI amount if none appears on your 2019 tax return.
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