Why does the SAVE Act prevent married women from voting?

Democrats have come out to say that married women will not be able to vote. My wife is a married woman and she told me that all she had to do is bring her birth certificate to town hall to register to vote. This is the same exact process that i went through to register to vote and I am not a married woman. I don't see what the problem is. In fact if you have a Real ID you do not even need a birth certificate.

Why does the SAVE Act prevent married women from voting?
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