This reject code is because a dependent on this return has filed their own tax return without indicating they would be claimed as a dependent.
If a dependent mistakenly indicated no one can claim them, the IRS has a new procedure that allows your return to be efiled.
You can get an Identity Protection Personal Identification Number (IP PIN) for the dependent, enter this on your return and re-file electronically.
Here are some good references:
IR-2024-294
Age, name or SSN rejects, errors, correction procedures
Protect Yourself From Tax-Related Identity Theft: Get an Identity Protection PIN
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