Thank you. Now let's look at what the Constitution actually says.
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Which has nothing to do with voting. It has to do with the method of selecting the Electors for President.
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Now let's look at what you probably were referencing which Article II, Section 4, Clause 1.
And it specifically states that or federal election Congress CAN set law for such elections..
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Now let's look at 52 U.S.C. § 10101 - U.S. Code - Unannotated Title 52. Voting and Elections § 10101. Voting rights (Link below)
Which is a law passed by Congress under their authority in 2/4/1.
It specifically says (I paraphrase) that voters cannot be denied the right to vote on a minor error or omission that is not materials to the vote.
A missing signature date on the envelope is just such a thing when the mail-in vote is received prior to the closing of the polls and when mail-in ballots are ALL date/time stamped upon receipt.
Hope that helps.
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