Enter Forms Mode and ensure that your 1041 shows that the "Final return" box is checked (see screenshot).
Ensure that you have actually made a distribution in the Distributions section of Step-by-Step (you need to make a distribution even if the amount is negative).
If all else fails, you can try adding $1 worth of miscellaneous income since distributing even that small of an amount is usually sufficient to push through excess deductions to the K-1(s).
