After you file

> ERO's are only paid preparers

This statement is contradicted by the instructions for IRS Form 8453-FE for 2021 which states, 

"EROs who are not paid preparers. Only an ERO who is not the paid preparer of the return has the option to enter their PTIN or ..."

This reply addresses the question: Do I have to sign Form 8453-PE as ERO to EFILE my Partnership return?