Check out Form 568 Booklet.  On page 11 of the 2021 version, cancelling the LLC is addressed.  If the booklet has been updated to a 2022 version, I have not yet referenced it.  I agree that unless the LLC was in existence for less than 15 days, filings are required.  I never cease to be amazed at the number of people who insist on forming an LLC, frequently with no idea why they are forming it or the additional work involved.  Good luck, and have a great tax season.