More information may help resolve your issue. For example, why were you not able to "use" the K-1 loss in 2016 to reduce your taxable income (e.g., was it a loss from a passive activity such as rental property, or did you not have basis to take the loss)? And, is the type of income on your 2018 K-1 the same "type of activity" (ordinary income vs rental income vs royalty) as the loss in 2016 and the income in 2017?
Passive losses for activities such as rental properties can only be offset against passive income.
It would be good to understand why TurboTax didn't carryover your loss from 2018 to 2019. To do so, you can take a look at the Federal Carryover Worksheet and/or Form 8582 from you 2018 tax return (and also within your 2019 tax return) to understand "what happened" to your carryover.
[Edited 5/15/2020|3:29pm PST]
@tammysteele1951
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