It's more complicated than that.  One must go to the Homepage, be careful to highlight only the Extension portion of the client line, then go to the Efile tab and update the acknowledgements only for the Extension, then you can finally Efile the federal return.  I have over 50 more tax returns to file that are on extensions filed back on April 8 that suddenly last week started showing the extension Marked for Efile instead of Accepted.  Why?  I have called Customer Support two times trying to get this resolved, noone knows what to do except to repeat the above on every client as I need to Efile the federal return.  Annoying.