MS Teams Whiteboard
MS Teams has a basic whiteboard integrated (note you can use any other annotation application via screen sharing). To use the Microsoft Whiteboard while in a meeting, click on "Share" in the meeting toolbar and you should see the "Microsoft Whiteboard" on the right. The whiteboard will allow you to scribble on the screen in different colours and erase it again.
The content of the whiteboard at any point can be exported to an SVG image via the cogwheel on the top right or alternatively the final contents of the whiteboard will be saved online and the unique link to it can be copied to your clipboard by clicking the blue circle icon on the top right.