If I e-filed an extension request in TY 2021, where can I find a copy of IRS form 4868 that should have accompanied my request?

see this link if you used Turbotax to file your extension

https://ttlc.intuit.com/turbotax-support/en-us/help-article/printers-printing/print-4868-extension-form-e-filing-turbotax-easy/L6MJM5wAT_US_en_US?uid=lborf5k0 

This solution was a little more convoluted.  I got there, and here is the path:  I had to answer the basic TurboTax questions for TY 2022 before I could even see the left nav and tax home.  I then clicked on Documents --> Download Tax PDF --> Something Else (from a pop-up menu) --> Download Extension.