You won't be able to file your tax return electronically if you input a K-1 schedule that doesn't have a federal ID number. And you are correct, TurboTax does not support form 8865, so you would have to mail your return in and physically attach that form after completing it manually.
There are many categories of individuals who are required to file form 8865, you would have to read through the instructions to form 8865 to see if you fall into one of the categories. You can learn more here: Form 8865 instructions
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