Dear A,
As an Independent Advisor and community user, I'll help you with your question.
You could try this; in order to avoid any other account credentials in cache, in any internet browser remove all browser cache and navigation history from "All time" select all options to clean, go to: https://teams.microsoft.com/, access with your Office 365 account, then verify if you can access through Teams "web-client", then start a meeting there in the browser, share your screen and try to use the Whiteboard and check behavior, if's works, perform below process in the local client on Windows 10:
First, update your Windows 10 installation, check out if has updates pending and run them all.(this is really important)
https://support.microsoft.com/en-us/help/402766...
Also you can install last Windows 10 build with the update assistant:
https://support.microsoft.com/en-us/topic/windo...
- Then re-start your PC.
- Close Microsoft Teams (Check out if appears in Windows toolbar and close it).
- Copy and paste following path Windows File Explorer:
%appdata%\Microsoft\Teams
- Delete all content in that folder
- Uninstall Teams from Control Panel
- Install last Teams desktop version from below link:
https://www.microsoft.com/en-us/microsoft-365/m...
- Re-start Microsoft Teams.
- Access with your personal account (Sign in there).
- Then, check out app behavior.
Regards,
Renzo