The issue is that the final scenes and dialogue seem to be tied to the host's character so no other players can take the final dialogue. In this case one of the other players has far more interaction with the NPC's and so it would be better for them to do the dialogue.
The only two solutions I can think of (if I haven't missed some simple way for the final dialogue to be taken by another character) is changing the host character or copying the other players data and overwriting the host character (effectively making two of the same character in the party) but I have not found any way to do this (and moving the Artifact via OSI like this post
https://www.reddit.com/r/BaldursGat...moving_custom_multiplayer_party_members/ does not seem to have changed who takes the dialogue.
Does anyone have an suggestions or tips?