The reject email should say why and have a reject code. A common reason is for the AGI.When did you file 2017? If it was late in the year try putting in zero for the AGI. And see this, <a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/replies/5595742">https://ttlc.intuit.com/replies/5595742</a> If you can’t get it to efile you will have to print and mail it.
try $0 for AGI , if that doesn't work do as sated above