I couldn't find your "original" question, but... if you can't trigger what you're supposed to trigger with Lyvia... well, you have to send away Tia by telling her: "Tia, darling, why don't you go and chop some logs? I have to seduce another chick".
You couldn't find my original because there isn't one that's mine, but...mate...I literally quoted the answer, you could've followed the quotes to find the question to which your answer isn't an answer.
What I couldn't do for a while is
"Sit with Lyvia at the campfire in the evening" (questlog)
"13.Talk to her again inside the camp when she's sitting at the fire" (walkthrough)
a short cutscene that didn't want to trigger, however it's
necessary to not outright kill mercenaries but to have the option to recruit mercenaries.
"(merc band name) will rise!" was the only response from Lyvia when talking to her,
and just sitting at the fire just whenever resulted in the message "Time passes as you watch the flames."
Questlog was useless, walkthrough was useless, and close all suggestions here including sending Tia away were useless, until I found the one that
actually addressed the exact problem with the exact solution:
I just had to sit with Lyvia at
exaclty 18:00 to progress. Which is ridiculous. But worked. And Tia was also sitting there so that wasn't an issue.
(I'm leaving this deliberately keyword stuffed comment to help others who use the search function to find the answer.)