I got this same message, on TurboTax Deluxe desktop (not online). I have gone through the HSA forms repeatedly, and everything looks right (my job has the insurance and the HSA, I'm the only HSA and insurance, everyone is covered). Think you've got a bug or something here.
We've used turbotax for years, so we imported last year to start this year. Not sure if that changes things - in 2018 the HSA was only part of the year (the latter half).
(Frustrating how many more of these questions I'm having to answer for myself this year - looks like TurboTax has degraded its import powers. I shouldn't have to be looking at the output of last year's turbotax to answer a question.)
