Where does the Church claim that? And why is not every papal election unanimous on the first ballot?
Hi. There are lots of references to the HS in papal selection (while also acknowledging that cardinals have the free will to ignore the HS)- just one is From JP2s papal annunciation but references to the HSs presence go back a long ways for whatever it may be worth: over the age of eighty] in particular should lead the People of God assembled in the Patriarchal Basilicas of Rome and in other churches in the Dioceses throughout the world, supporting the work of the electors with fervent prayers and supplications to the Holy Spirit and imploring for them the light needed to make their choice before God alone and with concern only for the “salvation of souls, which in the Church must always be the supreme law”
In view of the sacredness of the act of election and thus the need for it to be carried out in an appropriate setting where, on the one hand, liturgical actions can be readily combined with juridical formalities, and where, on the other, the electors can more easily dispose themselves to accept the interior movements of the Holy Spirit, I decree that the election will continue to take place in the Sistine Chapel.
From the Pauline Chapel of the Apostolic Palace, where they will assemble at a suitable hour in the afternoon, the Cardinal electors, in choir dress, and invoking the assistance of the Holy Spirit with the chant of the Veni Creator, will solemnly process to the Sistine Chapel of the Apostolic Palace, where the election will be held.