Permalinks 404 not found

Hello,
I have a problem with permalinks in my website martha-care.com

I have polylang and woocommerce both installed and I would like to make a multilingual store.

In permalinks settings I have:
– Common settings -> Post name
– Product permalink base -> Shop base with category

In Settings-> Languages -> Settings I have:
– “The language is set from content” (Posts, pages, categories and tags urls are not modified.)

In order to make the multilingual possible I read that I have to switch this last option to:
– “The language is set from the directory name in pretty permalinks” (Example: http://martha-care.com/en/my-post/)

The problem is that, if I make this switch that I have just mentioned, I get a 404 page not found error for every single product page.
Other things, included the general store, do not show any problem instead.

I surfed the internet but I have not find anything yet.

Do you have any idea of how I can fix it?

Thanks in advance.

Best regards,
Alessandro

https://ww.wp.xz.cn/plugins/polylang/