Favorites folder does not contain favorites

On all my mailboxes, including the outlook.com one, the Favorites folder is empty even if I have favorites in my inbox.

Favorites is empty:

I have a starred email:
image

Is there a difference between favorites folder and starred emails ?

Have the same problem.
I’ve saved several Favorites, but they dont show.

But…
In listings they are marked as Favorites…

I have now tested creating Favorites with several language settings, but nothing works.