So, uh, can i not do the capon dlc if im on the

The dialogue option isnt popping up…

SPOILER:
im talking about the part at the end where he is with his retinue to the end of the map to end the game

Short answer: No.

Long answer: The DLC is meant to continue on from the Robber Baron Quest with Hans Capon, so unfortunately I believe the DLC cannot be accessed after a certain point in the game.

I started my hans capon DLC when he is at the end of the map, near neuhof, I just talked to him and the dialogue popped up, I think it might be a bug at your side

Thanks for the responses guys ill try to figure it out