Hello, thanks for your response. After rebooting 4ish times, the system tray icon came back. Some combination of rebooting and reducing the number of other icons seems to help but can’t pinpoint exactly what did it. I was able to successfully empty my odrive trash. Thanks!
It sounds like the odrive icon may have been being crowded out by other icons. I know that this can be an issue once the number of icons becomes high. There are some applications that Mac users will use to try to manage this (Dozer and Bartender, for example), although I haven’t tried them.