If I restart extension Ubuntu Appindicators, then only one icon stays.
Ubuntu is 21.10 and Viber is 16.1.0.37
If I grep Viber in processes, situation is same, before and after restarting appindicators extension...
root@mypc:/home/user# ps -afx | grep Vib
13244 ? SLl 0:01 | \_ /opt/viber/Viber
13264 ? S 0:00 | \_ /opt/viber/libexec/QtWebEngineProcess --type=zygote --no-zygote-sandbox --application-name=ViberPC --webengine-schemes=qrc:sLV --lang=en-US
13265 ? S 0:00 | \_ /opt/viber/libexec/QtWebEngineProcess --type=zygote --application-name=ViberPC --webengine-schemes=qrc:sLV --lang=en-US
13267 ? S 0:00 | \_ /opt/viber/libexec/QtWebEngineProcess --type=zygote --application-name=ViberPC --webengine-schemes=qrc:sLV --lang=en-US
13313 pts/0 S+ 0:00 | \_ grep --color=auto Vib
Actually I have solved issue by following this related answer
Viber indicator not working
after editing viber.desktop in /usr/share/applications
Changing line
to:
Appindicator icon is working fine.