Has anyone actually purchased the Passion Monument Subscription for France? Have you used it to purchase concert tickets at Sainte Chapelle?
https://www.monuments-nationaux.fr/en/passion-monuments-subscription
The price for the first year is €45 for 1 person, €70 for 2. In addition to free, unlimited entry to a number of sites throughout France, it offers a discount on some cultural events like concerts at Sainte Chapelle.
I'm looking at a concert at Sainte Chapelle in April and the pass would bring the ticket price from €60 to €30.