Please use this thread going forward: Exchange Vows Grayed Out on wedding arch | EA Forums - 4990453
I am also now having this issue. The exchange vows is greyed out saying finance is not on the lot (they were both there and standing next to the arch).
I thought it was cause one was a teen so I aged them up. Nope. Removed one of the sims from family and then it wasn't greyed out anymore, but they "fiance" kept trying to leave the lot and the exchange vows interaction wasn't popping up for the one left in the household, despite being clicked.
I then used the control sim mod to control the non-household fiance and all the options were greyed out for him even though when he was in the household, the only one not showing was the exchange vows.
I have a lot of mods but prior to the new patch, I have never had that issue.
At least the sims sit in their seats now (mostly) 😅
I'm having the exact same issue! prior to this patch, weddings mostly worked for me but now I can't even make them exchange vows because it keeps saying the fiance isn't around
