Flatpak and Tray Icons

Hi Folks,
does anyone know if #flatpak supports system tray icons?
I am currently testing the flatpak #signal-desktop application but it doesn't shows any tray icon not even in the preferences that is available as option, but reading on internet it may be activated with these options: --use-tray-icon --start-in-tray
However when I run:
flatpak run org.signal.Signal --use-tray-icon --start-in-tray
The icon in the tray isn't displayed.
My system is #Debian Testing with #XFCE as #linux-desktop environment, what do you think?
My best,
D. social.isurf.ca/display/c443a5

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