Re: Help with rejected W-2/W-3 efile
The first submitted W-2 form might contains all your employee names. That could be the reason why they mark the second submission as duplicate.
You can also call the SSA directly to ask for more clarification. Please go to this link from the SSA website to get their phone number: https://www.ssa.gov/employer/bsohbnew.htm.
If you have any questions, please let us know. Thanks!