"Add Folder Sync Connection" Button missing


I’m supporting a couple of Windows clients with nextcloud client installed. One of the useres is missing the button “Add Folder Sync Connection” in the NC client main account view.

Does anyone have an idea under what condition this button will not show up?

Thanks a lot!

//EDIT: The issue, that I raised here, was based on wrong assumptions. Once I visited the client personally and did not rely on Information given to me by first level support, I figured out the problem myself. There was simply an old version of the client installed.