Third party app icons (Discord, Steam, etc.) are not showing up in the tray portion of the top panel on Elementary OS 6 (Odin). Native icons like network, microphone, etc. work, just not third party indicators.
Manually started the indicator-application service, this was the output:
(process:4600): indicator-application-service-WARNING **: 19:54:31.377: Unable to get >watcher name 'org.kde.StatusNotifierWatcher'
(process:4600): indicator-application-service-WARNING **: 19:54:31.377: Name Lost
Those wingpanel apps were supposed to fix this but for some reason they just aren't working.