Understand. Enter your three states. MI first with ending date 12/31/2020. Then enter yours and spouse's other states with beginning date 1/1/2020 and don't overlap with MI start, but should end 1 day prior to MI start. Then enter MI again with ending 12/31/2020. Go all the way through to done with sales taxes. Then revisit and delete the first MI line and then done with sales taxes. The error should clear.
This needs to match what is entered in the "My Info" section for your dates in each state as well.
[edited 4/4/2021 3:57pm EDT]
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