Good evening Renaud and welcome back!
Thank you for reaching out to us.
We are sorry to hear about the 404 error messages you are getting.
I would love to help you with this topic.
I can not create reccurents events (each weeks, each months…) I always have a 404 as I create one in the foreign language.
Full disclosure, the good folks from Polylang tested and declared full compatibility very recently (we also pitched in to help). However, we have not fully completed these tests on our end.
This should actually be done by end of day tomorrow so your timing is excellent.
In the meantime, if you are in a hurry (especially on a live site), try the following:
- Re-save your permalinks after creating recurring events
- Reach out to the folks at Polylang since they have a bit of a head start on us.
Hang in there!
Geoff B.