We received a letter from the IRS saying we did not sign our 2018 return, We e-filed with Turbo Tax. What happened?

[Critter]

Did you also mail in a return ?

[Critter]

Did you e-file your tax return and was it accepted?  


Use this TurboTax website to check the status of an e-filed return and if it was either accepted or rejected -https://turbotax.intuit.com/tax-tools/efile-status-lookup/

If accepted by the IRS use the federal tax refund website to check the refund status -  https://www.irs.gov/refunds