You are missing the point that a return HAS been filed, using your client's SSN.
It is either a mistake, by whoever did file the return, by the IRS if they keyed in the number wrong (yes, there are still folks who file by paper).
OR - it's identity theft. (And you should notify your client of that possibility)
The reject notice isn't saying YOU did something wrong.
"the game of life is hard to play"
If a post answers your question, click on *Accept as solution* for future searches