In the company I work at, there are telepresence screens in each conference room that appear in Teams.

Projecting something onto the screen is done using Teams, so I can't disable Teams during the presentation. People often connect in from other conference rooms or their desks, by joining the call.

ICT probably wouldn't allow us to make another user account.

I agree that making a second user account is good practice for IoT meetups, church groups, or other presentations, but it might not actually work well in this company. Teams has plenty of other issues though, such as screen sharing in a group call after unplugging HDMI, or microphone input selection issues.

That's a valid workaround that shouldn't be needed.

FWIW I turn off all contact apps (email, chat) entirely if it's important.

Is that easier than just switching user account? Essentially all we're talking about is having a separate environment. Maybe desktop environments could support multiple environments per user more easily, but it's not too bad to set it up with a separate user account.

That doesn't really work when the app you're presenting with is actually MS Teams, as for whatever reason, during a call when you're screen sharing, Teams still shows notification pop-ups.