Congress has NO ROLE in the appointment of the President, this is the SOLE PREROGATIVE of the State Legislatures (and of Congress’s 3 electors since 1960).
IF the State Legislatures fail to appoint 270 or more Electors to vote for one man, then the HOUSE (not Congress) elects the President from the top 3 electoral vote getters, and the Senate elects the Vice President from the top 2 electoral vote getters. In case the House has to elect the President, each State gets one vote (California = 1, Wyoming = 1), and in case the Senate has to elect the Vice President, each Senator gets one vote.
The whole POINT of this complicated machinery was for the States acting as sovereigns to appoint the President, with all branches of the Federal government excluded ON PURPOSE.
This is why Congress cannot “certify” the choice.
My response was to the issue of which Congressional “House” would be in place at the time of the stated action/certification (of anything). I said it is the current Congress vs the new one. New one, current one; Congress, House. Whatever. Your point wasn’t what I was referring to.