You must use TurboTax Business to prepare and file an 1120S tax return for an S-Corp and prepare a K-1 using that software. Is that what you used and did you file the business tax return?
The filing deadline remained March 16, 2020 for an S-Corp form 1120S. If you missed the deadline, you might be able to appeal it saying you thought the deadline was extended to July 15 the same as corporate tax returns and personal tax returns.
Here is where to buy the Business software to download and install on your personal computer: https://turbotax.intuit.com/small-business-taxes/
