Selecting a trash folder during Email settings

Hello guys,
i am actually doing the settings of my Email modul and i have some difficuties when selecting a trash folder.
At a certain level i have to select a trash folder in order to import my emails from my outlook account but there is no option to select the trash folder (the list is empty).
Here is a screenshot of the problem


Normally there should be a list of trash folders for me to select one but in this case there is nothing as you can see.
Do someone have an idea of where the problem is ?
Thanks