How do you know it wasn't received? Did you mail or efile it? If you efiled does it say Accepted? The IRS is taking longer this year and the IRS Lookup website is not reliable or always updated so they might have your return. It is taking 6 months or more to process returns.
You can check your efile status here,
https://turbotax.intuit.com/tax-tools/efile-status-lookup
When you efile you get back 2 emails. The first email only confirms the transmission. The second email says if the IRS (or state) Accepted or Rejected your efile.
When you log into your account you should also see the status and if it was Accepted or Rejected, Started, Printed, Ready to Mail, etc. What does it say?
