I would start with reaching out to the fiduciary and asking them to give you the Schedule K-1 that is marked "final".
You might also see what was reported to the IRS under your Wage and Income transcript. You might get some of the information regarding the loss from the transcript. Here is how to do that.
You can also enter the information into TurboTax as if you received Form 1099-B. Although, if you are supposed to have Schedule K-1 and don't report it, it may generate a letter from the IRS.
Another thought about your situation is that the letter you received may be directing you to report the basis loss and that would go on 8949. But you would still need to report Schedule K-1.
Where do I enter or import a Form 1099-B?
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