I do not think any electors are certified directly by the legislature. They are certified by the SOS who is supposed to follow the legislatures laws as for how to conduct an election and certify that it was.I'm at a loss to see how two sets of electors could both be certified by the legislature of a state. I know there were instances where a second set was chosen awaiting the outcome of a court case, but not where the legislature had two different sets approved.
That is the crux of the unconstitutional electors argument, the election was conducted beyond the laws of the legislature as the constitution prescribes but then was certified, by the SOS’s, as if it was.
Those electors are no more constitutional than any other slate of electors.
I wish some here were as concerned about the outright violations of the explicit words of the constitution as they are the unclear nature of what a VP can do when presented with unconstitutional electors…