After you file

I'm in the  same situation.   I',  attempting to file my 2021 Federal  tax  along with  a $1784. 00  I owe  them , It  will not  take my  efile.   I file by  paper  last year  along with another   a check , IRS   cashed my  check , yet never entered my  tax information  in their system. I  found  this  out   by going   to   my IRS   accont .  There  state  I'm a  non-file    yet   they  can   cash my  check.     What do I do to get this fixed ,  I want to  get back to filing   by efile. Do I have to  file  a 2020  tax  return again ?