Large visible indicator when mic is on/off
Can you add a REALLY BIG, RED, partially transparent BANNER, that's always on top and says MY MIC IS ON (& maybe GREEN when its off)?
Macular degeneration makes little stuff (like the mic icon) disappear sometimes.
Michael McDaniel commented
YES! a microphone icon just left of my avatar at the top that shows my MIC status. (And let me click on it to toggle it)
You could also show the status in the taskbar too. (full screen) anywhere and everywhere is helpful.