When you go through the File tab there are 3 steps. Keep going to the very end. Does it think you are mailing your return?
You can try to switch to efile. Click on Add a State to let you back into your retun.
https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online...
