In Summits, players may only give a resource with Transfer Asset if they have the consent of the player with the Monopoly for that resource. Consent is not needed if no one has the Monopoly.
In the Call to Order, the player who called the Summit may force the Monopoly holder's consent by returning 1 Favor of theirs to them.
Act: 2
A: Only the Favors needed for the Transfer Asset action; so if the resource in question has one key, then one Favor. You do not need to give them another Favor to get Monopoly consent.