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Help with rejected W-2/W-3 efile

I have both 941 and 943 employees.  I as able to successfully e-file my W-2's for the 941 employees however I received notice that the 943 e-file was rejected by the SSA as a "duplicate".  I double checked and there are no duplicate employees in the filings and I clearly marked one W-3 as 941 and the other as 943.  Do I need to just mail the rejected filing to SSA?  Has anyone else encountered this?