I just want to echo alot of the comments on here. The browser version of Whiteboard needs significant expansion of its functionality.
As a lecturer most of my students access their IT resources through the Web Browser versions of Office 365 and Teams, on a huge variety of devices.
I would like to see functionality built into other platforms such as Padlet which makes it easy to embed audio, video, live recorded video, pictures. Until it has these features on the web version I see limited use of it within real teaching institutions. It would be nice if it integrated into the education side of Teams so you could add it to the ribbon menu and your students could access the whiteboards from there, or make them embeddable into Class Notebook as a live whiteboard.