Because the votes were certified according to state law.
The effort you appear to be referring to was the illegal fake electors plan Chesebro and others have already pleaded guilty to.
"The effort you appear to be referring to was the illegal" Yes everything is illegal in a captured system. Get used to it.
I likely broke the law for legally and justly voting in the State of CA. The post office lost my mail in ballot. I never received it. Checked on line for it claimed it was sent.
I went in and voted early. technically my mail in ballot is now null and void. Though with that mail in ballot the person that took my ballot likely for profit can vote under provisional ballot. Using my name. Technically I could've voted twice. I only voted once. Though I can go to jail for technically voting twice. Which I can not prove i didn't vote twice because there no system for accountability on votes IE:ID requirements
That is how US code is set up.
""The president of the Senate must open all the "certificates" and "papers purporting to be certificates"
Clearly can not import(purporting) the electoral votes as there was a requirement for return of those state electoral votes. Which is in US code.
In 1887 it was set to one Rep from house and Senate. Which the RINO's changed after the 2020 election to 1/3 of the house senate is required for the return.
https://www.thes2project.com/storage/101/The-Electoral-Count-Act-of-1887.pdf