Here is how to solve the issue particularly at Centos Stream 9 with Gnome 40.4. But this issue is not only related to Centos but more to any linux version using latest Gnome GUI. Gnome decided to get rid of the Tray by default (apart of centos 7 where the old version of Gnome still has tray)
- Install GNOME Shell Extension for Legacy Tray Icons:
sudo dnf install gnome-shell-extension-appindicator
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Reboot the machine and then activate the extension
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Then enable it either through GNOME Extensions app or using:
gnome-extensions enable appindicator@gnome-shell-extensions.gcampax.github.com