How long has it been since you efiled?
Did you get any emails after efiling? You should have gotten 2 emails--the first one that the return had been submitted, followed by a later one in 24-48 hours saying if it was accepted or rejected.
When you log back into your online account, what is showing for "Return status?" Does it say pending, accepted, rejected, or something else?
You can also check the efile status with this tool. Does it show pending, accepted, rejected, or no results found?
https://shop.turbotax.intuit.com/efile/efile_status_lookup.jsp