@maxence.ly.76 It shows on Google Play Console that the products are available in France... I honestly have no idea what could be causing this issue.
I can see in Google Play Console that there are some users that have recently purchased the upgrade in France on Android. So it doesn't seem to be a country wide block right now...
Is there any way you can generally use the app on a computer instead? It does run better on a computer, and you could make the purchase there without using Google Play as well.
Is this on Android or iOS?
Thank you