From @Mike9241:
The IRS has waived k-3 reporting for 2021. There is a problem if that K-3 reports foreign tax credits. There isn't a way to claim those credits without the form. However, in many cases, there will be no FTC. Your options are to file by 4/18/2022 and amend if there is FTC or file an extension and wait for the partnership to provide the K-3 info. To file now uncheck the K-3 box on the Turbotax K-1 form.