If ALL client returns are being rejected as duplicate filings, Id be very worried about a data breach of my client data....you may wish to contact your cyber security company and see if they can help you confirm whether your system has been compromised or not.

Here is a post with similar problem.   don't know if they've figured out if it was a security breach or not

High number of rejections R0000-194 - Intuit Accountants Community

" Some are my children so I know they are not duplicates "

That just means you know YOU haven't filed using their SSN's.

It has nothing to do with whether hackers have gained access to your data, and filed returns using the kids SSN's.

I am NOT having that problem.