In Summits, you can take a new Negotiation action, Transfer Guild Support:
Give a Guild card. This requires the Advocate's consent if they are in play.
Forcing this with Return Favors costs Favors equal to the Guild card's raid cost. You may force the Advocate's consent by returning 1 Favor of theirs to them.
Players cannot be forced to give protected Guild cards.
Act: 2
A: Only the Favors needed for the Transfer Guild Support action; so if the Guild card in question has two keys, then two Favors. You do not need to give them another Favor to get Advocate consent.