We use dedicated accounts for our conf room PCs. You invite the room to the meeting, join from that PC. Works well and avoids the problem you mention. People do

We use dedicated accounts for our conf room PCs. You invite the room to the meeting, join from that PC. Works well and avoids the problem you mention. People don’t use personal accounts on conference room pc. Also using that program to ‘freeze’ known good config of pc and reboot nightly helps ensure it’s always working the next day regardless of what people mess up during the day.