E-file submit failure

I have been using TT since 2016.  I went through all the steps to e-file including tax forms, security input, etc.  I submitted my return last week without any errors indicated.   I waited several days and decided to check to make sure the return was received.  TT says no e-file was submitted and IRS has sent no confirmation.  I have e-filed successfully before.  Thanks for any advice.

 

ctmsnr