site duplicated

Hello
First, sorry if my english is bad…
I’m duplicating my website (where Polylang is installed and work fine) into a new server, on an other domain.
It’s working, the site appear at the new adress, but I have issues with Polylang : when I disable it (renaming the plugin folder), I can see my homepage, and if I don’t, a 404 page is displayed, and the admin adress redirect me to the original adress.

Is there a file to modify in the plugin folder to fix the issue ?

I hope to be clear enough !
Thx for your answer.
Mika.

https://wordpress.org/plugins/polylang/