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Now it’s rejected due to IND-507-01

 

i double checked the social security number for each of my dependents. They are correct. 
says the Dependent SSN was previously used on a return for the same tax period. Does this have anything to do with me submitting my return multiple times and getting rejected? And why didn’t this come up before as a reject code?

Do you suggest I get an IP PIN which is what it seems it’s suggesting?