Partnership, Screen 6.
I submitted a couple e-file extensions, but neglected to enter a '1' in the "Print Extension" field. It was blank .
The 'e-file extension' box was automatically checked when I e-filed.
F4 Efile Status says "This Federal Extension Filing was accepted...".
BUT I don't know if it submitted as a code 09 or 31.
Try e-file > e-file support tools > View e-file
Wade through the file there, with your secret decoder ring and you should be able to find what you want. I don't have one to test with, so you are on your own.